- document
- Penning, W.E. (author) report 2001
- document
- report 1994
- document
- Vries, I. de (author), Vries, M.B. de (author), Goossens, J.G.C.M. (author) report 1990
- document
- Baarse, G. (author) report 1985
- document
- Baarse, G (author), Beek, E. van (author), Dijkman, J.P.M. (author) report 1980