- document
- Bons, C.A. (author) report 1994
- document
- Bleeker, F.J. (author), Bons, C.A. (author) report 1993
- document
- Uittenbogaard, R.E. (author) report 1992
- document
- Groot, S. (author) report 1979
- document
- report 1977
- document
- Dingemans-Tanis, M.P. (author) report 1975