M. Hazewinkel
I.W. Knowles, R.T. Lewis
C.J. Colbourn, R. Mathon
G.M. Grossman, Kenneth Rogoff
F. Klix, J. Hoffmann
Flaviano Battelli, Michal Fečkan
D. Emerson, P. Fox, N. Satofuka, A. Ecer, Jacques Periaux
M. Mimura, T. Nishida
J.B. Cooper
J. Barwise