1. BIOKON—Geschichte der Bionik
https://www.biokon.de/bionik/geschichte/
2. DIN ISO 18458:2016-08. Biomimetics—Terminology, Concepts and Methodology,2015
3. VDI 6220 Blatt 1, Bionik. Grundlagen, Konzeption und Strategie = Biomimetics: Fundamentals, Conception, and Strategy,2021
4. Crutch with Elbow and Shank Springs;Herr;U.S. Patent,1994
5. Variable-Mechanical-Impedance Artificial Legs;Herr;U.S. Patent,2003