Physiologically Based Control Laws Featuring Antagonistic Muscle Co-Activation for Stable Compliant Joint Drives
S. Annunziata, A. Schneider, Applied Bionics and Biomechanics 9 (2012) 249–266.

No need for a body model: Positive velocity feedback for the control of an 18-DOF robot walker
J. Schmitz, A. Schneider, M. Schilling, H. Cruse, Applied Bionics and Biomechanics 5 (2008) 135–147.