Journal article (2000) - T Zijlstra (author), JA Heimberg (author), E.W.J.M. van der Drift (author), D Glastra van Loon (author), M Dienwiebel (author), LEM de Groot (author), JWM Frenken (author)

Journal article (1997) - HJ Voorma (author), E Louis (author), J Friedrich (author), NB Koster (author), LA Smaenok (author), F Bijkerk (author), T Zijlstra (author), LEM de Groot (author), E.W.J.M. van der Drift (author), BAC Rousseeuw (author), J Romijn (author)