- document
- Bokhorst, M. (author), Los, F.J. (author) report 1997
- document
- Vledder, G.P. van (author) report 1994
- document
- Valk, C.F. de (author), Otta, A.K. (author) report 1993
- document
- Booij, N. (author), Eldeberky, Y. (author), Dekker, J. (author) report 1993
- document
- Valk, C.F. de (author), Zitman, T.J. (author) report 1992