- document
- report 1986
- document
- report 1985
- document
- Flokstra, C. (author) report 1983
- document
- Flokstra, C. (author) report 1983
- document
- Vries, W.A. de. (author) report 1983
- document
- Koeman, J.W. (author) report 1983
- document
- Flokstra, C. (author) report 1983
- document
- Flokstra, C. (author) report 1982
- document
- Vries, W.A. de (author) report 1981
- document
- Vries, W. de (author) report 1979
- document
- Koeman, J.W. (author) report 1978