G. Adriaensen, the Netherlands

R.L.A.W.  Bleys, the Netherlands

F. Datema, the Netherlands

D. Hanga, Austria

H.G. Gassner, Germany

D.J. Menger, the Netherlands

M. Muradin, the Netherlands

S. Paun, United Kingdom

A. Tasman, Switzerland

R. Xavier, Portugal

F. van Zijl, the Netherlands