- document
- Van Rooijen, H. (author), Wassenberg, F. (author), Gunsing, R. (author), Meijering, G. (author) book 1999
- document
- Kleinhans, R. (author), Wassenberg, F. (author) book 1999
- document
- Raat, R. (author), Ouwehand, A.L. (author) book 1999
- document
- Priemus, H. (author), Philipsen, E. (author) book 1999