- document
- Uittenbogaard, R.E. (author), Stolker, C. (author), Goede, E.D. de (author), Kester, J.A.T.M. van (author), Jagers, H.R.A. (author), Wijbenga, J.H.A. (author) report 2005
- document
- Icke, J. (author), Wijdeveld, A.J. (author) report 2003
- document
- Gils, J.A.G. van (author), Postma, L. (author) report 1988
- document
- Groot, B. de (author), Postma, L. (author) report 1982