- document
- Hengst, S. (author), Dirkse, C. (author), van der Cammen, J.J. (author) other 1998
- document
- Hengst, S. (author), Dirkse, C. (author) other 1997
- document
- Hengst, S. (author), Dirkse, C. (author), Stoop, J.A.A.M. (author) other 1996
- document
- Kuijer, M.M.R. (author), Mathu, Th.J.J. (author), Dirkse, C. (author) other 1996