Éditeurs Springer International Publishing AG

Cover for Diagnostic Competence of Mathematics Teachers: Unpacking a Complex Construct in Teacher Education and Teacher Practice - Mathematics Teacher Education (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Diagnostic Competence of Mathema... (2018)

Cover for Rahmatallah Poudineh · Economics of Offshore Wind Power: Challenges and Policy Considerations (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Economics of Offshore Wind Power... (2018)

Rahmatallah Poudineh

Cover for Wolfgang Spiess-Knafl · Impact Investing: Instruments, Mechanisms and Actors - Palgrave Studies in Impact Finance (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Impact Investing: Instruments, M... (2018)

Wolfgang Spiess-Knafl

Cover for Wortsman · Atlas of Dermatologic Ultrasound (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Atlas of Dermatologic Ultrasound (2018)

Cover for Pokorski · Progress in Medical Research - Advances in Experimental Medicine and Biology (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Progress in Medical Research - A... (2018)

Cover for Fayos Sol? Eduardo · The Future of Tourism: Innovation and Sustainability (Hardcover Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

The Future of Tourism: Innovatio... (2018)

Fayos Sol? Eduardo

Cover for Adolescent Substance Abuse: Evidence-Based Approaches to Prevention and Treatment - Issues in Children's and Families' Lives (Hardcover Book) [2nd ed. 2018 edition] (2018)

2nd ed. 2018 edition

Adolescent Substance Abuse: Evid... (2018)

Cover for Helbing · Towards Digital Enlightenment: Essays on the Dark and Light Sides of the Digital Revolution (Paperback Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Towards Digital Enlightenment: E... (2018)

Cover for Smart Micro-Grid Systems Security and Privacy - Advances in Information Security (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Smart Micro-Grid Systems Securit... (2018)

Cover for Saleh Faruque · Radio Frequency Multiple Access Techniques Made Easy - SpringerBriefs in Electrical and Computer Engineering (Paperback Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Radio Frequency Multiple Access ... (2018)

Cover for Multiple Access Techniques for 5G Wireless Networks and Beyond (Hardcover Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Multiple Access Techniques for 5... (2018)

Cover for Rodolfo I. Meneguette · Intelligent Transport System in Smart Cities: Aspects and Challenges of Vehicular Networks and Cloud - Urban Computing (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Intelligent Transport System in ... (2018)

Rodolfo I. Meneguette

Cover for Matthew R. Bennett · Digital Technology for Forensic Footwear Analysis and Vertebrate Ichnology (Hardcover Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Digital Technology for Forensic ... (2018)

Matthew R. Bennett

Cover for Cell Biology and Translational Medicine, Volume 1: Stem Cells in Regenerative Medicine: Advances and Challenges - Advances in Experimental Medicine and Biology (Hardcover Book) [2018 edition] (2018)

Cell Biology and Translational M... (2018)

Cover for Innovative Solutions for Sustainable Supply Chains - Understanding Complex Systems (Hardcover Book) [2018 edition] (2018)

Innovative Solutions for Sustain... (2018)

Cover for Aleksandra A. Bozhko · Convection in Ferro-Nanofluids: Experiments and Theory: Physical Mechanisms, Flow Patterns, and Heat Transfer - Advances in Mechanics and Mathematics (Hardcover Book) [2018 edition] (2018)

Convection in Ferro-Nanofluids: ... (2018)

Aleksandra A. Bozhko

Cover for Anthony B. Evans · Orthogonal Latin Squares Based on Groups - Developments in Mathematics (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Orthogonal Latin Squares Based o... (2018)

Anthony B. Evans

Cover for Behavioral Neurobiology of PTSD (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Behavioral Neurobiology of PTSD (2018)

Cover for New Methods in Fixed Income Modeling: Fixed Income Modeling - Contributions to Management Science (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

New Methods in Fixed Income Mode... (2018)

Cover for Mentorship Leadership and Research (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Mentorship Leadership and Research (2018)

Cover for The Soils of Egypt (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

The Soils of Egypt (2018)

Cover for Bernard Faye · Camel Clinical Biochemistry and Hematology (Hardcover Book) [2018 edition] (2018)

Camel Clinical Biochemistry and ... (2018)

Cover for Origin and Evolution of Biodiversity (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Origin and Evolution of Biodiver... (2018)

Cover for Cognitive Infocommunications Theory and Applications (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Cognitive Infocommunications The... (2018)

Cover for Cook · Zeptosecond Dynamics of Transfer Triggered Breakup (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Zeptosecond Dynamics of Transfer... (2018)

Cover for Contemporary Research in Adult and Lifelong Learning of Mathematics (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Contemporary Research in Adult a... (2018)

Cover for Furht · Digital Image Processing Practical Approach (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Digital Image Processing Practic... (2018)

Cover for Gupta · Statistical Physics of Synchronization (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Statistical Physics of Synchroni... (2018)

Cover for Zhang · Chiral and Topological Nature of Magnetic Skyrmions (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Chiral and Topological Nature of... (2018)

Cover for Tayyaba Azim · Composing Fisher Kernels from Deep Neural Models: A Practitioner's Approach - SpringerBriefs in Computer Science (Paperback Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Composing Fisher Kernels from De... (2018)

Cover for Jelena Barbir-Walter Leal Filho-Richard Preziosi · Handbook of Climate Change and Biodiversity - Climate Change Management (Hardcover Book) [2019 edition] (2018)

Handbook of Climate Change and B... (2018)

Jelena Barbir-Walter Leal Filho-...

Cover for Brian Kokensparger · Guide to Programming for the Digital Humanities: Lessons for Introductory Python - SpringerBriefs in Computer Science (Paperback Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Guide to Programming for the Dig... (2018)

Brian Kokensparger

Cover for Computational Methods in Systems Biology (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Computational Methods in Systems... (2018)

Cover for Computer Information Systems and Industrial Management: 17th International Conference, CISIM 2018, Olomouc, Czech Republic, September 27-29, 2018, Proceedings - Lecture Notes in Computer Science (Paperback Book) [2018 edition] (2018)

Computer Information Systems and... (2018)

Cover for On the Politics of Ugliness (Hardcover Book) [2018 edition] (2018)

On the Politics of Ugliness (2018)

Cover for Intracerebral Hemorrhage Therapeutics (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Intracerebral Hemorrhage Therape... (2018)

Cover for Stromal Immunology (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Stromal Immunology (2018)

Cover for Benjamin Bruce · Governing Islam Abroad: Turkish and Moroccan Muslims in Western Europe - The Sciences Po Series in International Relations and Political Economy (Hardcover Book) [2019 edition] (2018)

Governing Islam Abroad: Turkish ... (2018)

Cover for Smith · Introduction to Queueing Networks (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Introduction to Queueing Networks (2018)

Cover for Platelets in Thrombotic and Non-Thrombotic Disorders: Pathophysiology, Pharmacology and Therapeutics: an Update (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Platelets in Thrombotic and Non-... (2018)

Cover for Ronald M. Glassman · The Origins of Democracy in Tribes, City-States and Nation-States (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

The Origins of Democracy in Trib... (2018)

Ronald M. Glassman

Cover for Advancing Culture of Living with Landslides: Volume 2 Advances in Landslide Science (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Advancing Culture of Living with... (2018)

Cover for Precision Agriculture: Technology and Economic Perspectives - Progress in Precision Agriculture (Paperback Book) [Softcover Reprint of the Original 1st 2017 edition] (2018)

Softcover Reprint of the Original 1st 2017 edition

Precision Agriculture: Technolog... (2018)

Cover for The Emergence of EU Defense Research Policy: From Innovation to Militarization - Innovation, Technology, and Knowledge Management (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

The Emergence of EU Defense Rese... (2018)

Cover for Andy Kah Ping Tay · Acute and Chronic Neural Stimulation via Mechano-Sensitive Ion Channels - Springer Theses (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Acute and Chronic Neural Stimula... (2018)

Andy Kah Ping Tay

Cover for Gerald C. Liu · Music and the Generosity of God - Radical Theologies and Philosophies (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Music and the Generosity of God ... (2018)

Cover for Walter M. Goldberg · The Geography, Nature and History of the Tropical Pacific and its Islands - World Regional Geography Book Series (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

The Geography, Nature and Histor... (2018)

Walter M. Goldberg

Cover for Lake Victoria Fisheries Resources: Research and Management in Tanzania - Monographiae Biologicae (Paperback Book) [Softcover Reprint of the Original 1st 2017 edition] (2018)

Softcover Reprint of the Original 1st 2017 edition

Lake Victoria Fisheries Resource... (2018)

Cover for Arthur Asa Berger · Cultural Perspectives on Millennials (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Cultural Perspectives on Millenn... (2018)

Arthur Asa Berger

Cover for Jinlong Xu · Conveyor Belt Furnace Thermal Processing (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Conveyor Belt Furnace Thermal Pr... (2018)

Cover for Production of Plant Derived Natural Compounds through Hairy Root Culture (Paperback Book) [Softcover reprint of the original 1st ed. 2017 edition] (2018)

Softcover reprint of the original 1st ed. 2017 edition

Production of Plant Derived Natu... (2018)

Cover for Aspects of Management Planning for Cultural World Heritage Sites: Principles, Approaches and Practices (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Aspects of Management Planning f... (2018)

Cover for Thomas M. Coughlin · Digital Storage in Consumer Electronics: The Essential Guide (Paperback Book) [Softcover reprint of the original 2nd ed. 2018 edition] (2018)

Softcover reprint of the original 2nd ed. 2018 edition

Digital Storage in Consumer Elec... (2018)

Thomas M. Coughlin

Cover for Educational Technology and Narrative: Story and Instructional Design (Paperback Book) [Softcover Reprint of the Original 1st 2018 edition] (2018)

Softcover Reprint of the Original 1st 2018 edition

Educational Technology and Narra... (2018)

Cover for Joel L. Schiff · Rare and Exotic Orchids: Their Nature and Cultural Significance (Paperback Book) [Softcover Reprint of the Original 1st 2018 edition] (2018)

Softcover Reprint of the Original 1st 2018 edition

Rare and Exotic Orchids: Their N... (2018)

Cover for Students' and Teachers' Values, Attitudes, Feelings and Beliefs in Mathematics Classrooms: Selected Papers from the 22nd MAVI Conference (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Students' and Teachers' Values, ... (2018)

Cover for Bahman Zohuri · Hybrid Energy Systems: Driving Reliable Renewable Sources of Energy Storage (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Hybrid Energy Systems: Driving R... (2018)

Cover for Uwe Winkelhake · The Digital Transformation of the Automotive Industry: Catalysts, Roadmap, Practice (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

The Digital Transformation of th... (2018)

Cover for Ulrich Spandau · Practical Handbook for Small-Gauge Vitrectomy: A Step-By-Step Introduction to Surgical Techniques (Hardcover Book) [Second Edition 2018 edition] (2018)

Second Edition 2018 edition

Practical Handbook for Small-Gau... (2018)

Cover for Digital Milton (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Digital Milton (2018)

Cover for Thomas De Zengotita · Postmodern Theory and Progressive Politics: Toward a New Humanism - Political Philosophy and Public Purpose (Hardcover Book) [2019 edition] (2018)

Postmodern Theory and Progressiv... (2018)

Thomas De Zengotita

Cover for Exploring the Integer Addition and Subtraction Landscape: Perspectives on Integer Thinking - Research in Mathematics Education (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Exploring the Integer Addition a... (2018)

Cover for Daniele Santoro · Speaking Truth to Power - A Theory of Whistleblowing - Philosophy and Politics - Critical Explorations (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Speaking Truth to Power - A Theo... (2018)

Daniele Santoro

Cover for Mariacristina Rossi · Wealth and Homeownership: Women, Men and Families (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Wealth and Homeownership: Women,... (2018)

Mariacristina Rossi

Cover for Advances in Plant Ecophysiology Techniques (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Advances in Plant Ecophysiology ... (2018)

Cover for Bahman Zohuri · Hydrogen Energy: Challenges and Solutions for a Cleaner Future (Hardcover Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Hydrogen Energy: Challenges and ... (2018)

Cover for Bahman Zohuri · Thermodynamics in Nuclear Power Plant Systems (Hardcover Book) [2nd ed. 2019 edition] (2018)

2nd ed. 2019 edition

Thermodynamics in Nuclear Power ... (2018)

Cover for Evaluating Campus Climate at US Research Universities: Opportunities for Diversity and Inclusion (Hardcover Book) [2018 edition] (2018)

Evaluating Campus Climate at US ... (2018)

Cover for Radojcic · Reflections on Power Prediction Modeling of Conventional High Speed Craft (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Reflections on Power Prediction ... (2018)

Cover for Wolfram Schulz · Young People's Views of Government, Peaceful Coexistence, and Diversity in Five Latin American Countries: IEA International Civic and Citizenship Education Study 2016 Latin American Report (Paperback Book) [2018 edition] (2018)

Young People's Views of Governme... (2018)

Cover for Bullying Prevention and Intervention at School: Integrating Theory and Research into Best Practices (Hardcover Book) [2018 edition] (2018)

Bullying Prevention and Interven... (2018)

Cover for Advances in Nature Inspired Computing and Applications (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Advances in Nature Inspired Comp... (2018)

Cover for Petr Bob · ADHD, Stress, and Development - SpringerBriefs in Psychology (Paperback Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

ADHD, Stress, and Development - ... (2018)

Cover for Anna Blackwell · Shakespearean Celebrity in the Digital Age: Fan Cultures and Remediation - Palgrave Studies in Adaptation and Visual Culture (Hardcover Book) [2018 edition] (2018)

Shakespearean Celebrity in the D... (2018)

Cover for Recent Advancements in Materials and Systems for Thermal Energy Storage (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Recent Advancements in Materials... (2018)

Cover for Markus Rambach · Narrowband Single Photons for Light Matter Interfaces (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Narrowband Single Photons for Li... (2018)

Cover for Jesper Andreasson · Extreme Sports, Extreme Bodies: Gender, Identities and Bodies in Motion (Hardcover Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Extreme Sports, Extreme Bodies: ... (2018)

Jesper Andreasson

Cover for Harley Scammell · Interplay of Quantum and Statistical Fluctuations in Critical Quantum Matter (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Interplay of Quantum and Statist... (2018)

Harley Scammell

Cover for Dental Applications of Nanotechnology (Hardcover Book) [2018 edition] (2018)

Dental Applications of Nanotechn... (2018)

Cover for Management Perspective for Transport Telematics: 18th International Conference on Transport System Telematics, TST 2018, Krakow, Poland, March 20-23, 2018, Selected Papers - Communications in Computer and Information Science (Paperback Book) [2018 edition] (2018)

Management Perspective for Trans... (2018)

Cover for Tatiana Koshlan · Mathematical Modeling of Protein Complexes - Biological and Medical Physics, Biomedical Engineering (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Mathematical Modeling of Protein... (2018)

Tatiana Koshlan

Cover for Provenance and Annotation of Data and Processes (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Provenance and Annotation of Dat... (2018)

Cover for Ralf Kneuper · Software Processes and Life Cycle Models: An Introduction to Modelling, Using and Managing Agile, Plan-Driven and Hybrid Processes (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Software Processes and Life Cycl... (2018)

Cover for Modern Sensing Technologies (Book) [1st ed. 2019 edition] (2018)

1st ed. 2019 edition

Modern Sensing Technologies (2018)

Cover for Innovative Technologies and Learning (Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Innovative Technologies and Lear... (2018)

Cover for Information Security Practice and Experience: 14th International Conference, ISPEC 2018, Tokyo, Japan, September 25-27, 2018, Proceedings - Lecture Notes in Computer Science (Paperback Book) [2018 edition] (2018)

Information Security Practice an... (2018)

Cover for Alessandro De Iaco Veris · Practical Astrodynamics - Springer Aerospace Technology (Paperback Book) [Softcover reprint of the original 1st ed. 2018 edition] (2018)

Softcover reprint of the original 1st ed. 2018 edition

Practical Astrodynamics - Spring... (2018)

Alessandro De Iaco Veris

Cover for Rebecca M. Hayes · #Crime: Social Media, Crime, and the Criminal Legal System - Palgrave Studies in Crime, Media and Culture (Paperback Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

#Crime: Social Media, Crime, and... (2018)

Rebecca M. Hayes

Cover for Orthopedic Biomaterials: Progress in Biology, Manufacturing, and Industry Perspectives (Hardcover Book) [2018 edition] (2018)

Orthopedic Biomaterials: Progres... (2018)

Cover for Florent Thouvenin · Remembering and Forgetting in the Digital Age - Law, Governance and Technology Series (Hardcover Book) [2018 edition] (2018)

Remembering and Forgetting in th... (2018)

Florent Thouvenin

Cover for Claudia Liebelt · Beauty and the Norm: Debating Standardization in Bodily Appearance - Palgrave Studies in Globalization and Embodiment (Hardcover Book) [2019 edition] (2018)

Beauty and the Norm: Debating St... (2018)

Claudia Liebelt

Cover for All Too Human: Laughter, Humor, and Comedy in Nineteenth-Century Philosophy - Boston Studies in Philosophy, Religion and Public Life (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

All Too Human: Laughter, Humor, ... (2018)

Cover for Plant Structural Biology: Hormonal Regulations (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Plant Structural Biology: Hormon... (2018)

Cover for Kurt Lechner · Classical Electrodynamics: A Modern Perspective - UNITEXT for Physics (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Classical Electrodynamics: A Mod... (2018)

Cover for Hanna Makhavikova · Determinants of FDI in Central and Eastern Europe: The Effects of Integration into the European Union - Contributions to Economics (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Determinants of FDI in Central a... (2018)

Hanna Makhavikova

Cover for Michelle Obama’s Impact on African American Women and Girls (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Michelle Obama’s Impact on Afric... (2018)

Cover for Rodent Bioacoustics - Springer Handbook of Auditory Research (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Rodent Bioacoustics - Springer H... (2018)

Cover for Frank D. McCann · Brazil and the United States during World War II and Its Aftermath: Negotiating Alliance and Balancing Giants (Hardcover Book) [1st ed. 2018 edition] (2018)

1st ed. 2018 edition

Brazil and the United States dur... (2018)

Frank D. McCann

Cover for Longbing Cao · Data Science Thinking: The Next Scientific, Technological and Economic Revolution - Data Analytics (Hardcover Book) [2018 edition] (2018)

Data Science Thinking: The Next ... (2018)

Cover for Alexander Pechenkin · The History of Research on Chemical Periodic Processes - SpringerBriefs in History of Science and Technology (Paperback Book) [2018 edition] (2018)

The History of Research on Chemi... (2018)

Alexander Pechenkin