J. G. Rekers (Jan)
A.P.J.M. Siebes (Arno) and M.L. Kersten (Martin)
J.M. Anthonisse, J.K. Lenstra (Jan Karel) and M.W.P. Savelsbergh
J.W. Polderman
M. Desrochers
E.D. de Goede (Erik) and F.W. Wubs (Fred)
J.J. Rusch