- document
- Kessels, S. (author) book 1997
- document
- Koffijberg, J.J. (author) book 1997
- document
- Zwartenkot, R. (author), Graafland, A. (author), Priemus, H. (author) book 1991
- document
- Spaans, M. (author) book 1990
- document
- Vijverberg, G. (author) book 1989