- document
- Rijn, L.C. van (author), Reniers, A.J.H.M. (author), Zitman, T.J. (author), Ribberink, J.S. (author) report 1995
- document
- Zitman, T.J. (author) report 1993
- document
- Zitman, T.J. (author) report 1993
- document
- Valk, C.F. de (author), Zitman, T.J. (author) report 1992
- document
- Zitman, T.J. (author) report 1990