- document
- Vledder, G.P. van (author), Zijlema, M. (author), Rogers, W.E. (author), Groeneweg, J. (author) report 2007
- document
- Maiwald, K. (author) report 1972
- document
- Valk, C. de (author) report 1988
- document
- Dingemans, M.W. (author) report 1999
- document
- Wenneker, I. (author), Groeneweg, J. (author) report 2007
- document
- Ris, R.C. (author), Somers, C.M.G. (author) report 1999