Jan Visser (EDT)/ Muriel Visser (EDT)
(2)
Christa E. Muller-sieburg (EDT)/ Beverly Torok-storb (EDT)/ Jan W. M. Visser (EDT)/ Rainer Storb (EDT)
(1)
Jan Baars (EDT)/ Henk Visser (EDT)
(1)
Jan Van Eijck (EDT)/ Vincent van Oostrom (EDT)/ Albert Visser (EDT)/ Logic Colloquium/
(1)
Jan Visser (EDT)/ Muriel Visser-valfrey (EDT)
(1)
Qiping Chu (EDT)/ Bob Mulder (EDT)/ Daniel Choukroun (EDT)/ Erik-jan Van Kampen (EDT)/ Coen De Visser (EDT)
(1)