- document
- Thabet, R.A.H.A. (author) report 1985
- document
- Groen, P. van (author) report 1981
- document
- Deelen, C. (author) report 1980
- document
- Uwland, J. (author) report 1979
- document
- Kuur, P. van der (author) report 1979
- document
- Jorritsma, J. (author) report 1977