- document
- Kester, J.A.T.M. van (author), Goede, E.D. de (author) report 1993
- document
- Savornin Lohman, A.A.M. de (author), Menke, M.A. (author) report 1993
- document
- Stelling, G.S. (author), Gerritsen, H. (author), Mooiman, J. (author) report 1992
- document
- Boderie, P.M.A. (author), Groot, S. (author) report 1992