- document
- Pereboom, D. (author), Van den Berg, C.C. (author) report 2002
- document
- Damsteeg, D.A. (author), Goudeau, F.M. (author), Vermeulen, M.C.H. (author), Winckers, A.L. (author) other 1989
- document
- Hengst, S. (author) other 1988
- document
- Hengst, S. (author) other 1986