K. H. Hofmann's article “A memo on the exponential function and regular points”
In: Archiv der Mathematik, Jg. 59 H. 1, S. 38-411992
Kinematic model of a stick insect as an example of a 6-legged walking system
In: Adaptive Behavior, Jg. 1 H. 2, S. 155-1691992