- document
- Steetzel, H.J. (author), Coeveld, E.M. (author), Graaff, J. van de (author), Diermanse, F.L.M. (author), Gent, M.R.A. van (author) report 2007
- document
- Gent, M.R.A. van (author) report 1999
- document
- Groenendijk, H.W. (author), Gent, M.R.A. van (author) report 1998