- document
- Hengst, S. (author), Dirkse, C. (author), de Wilde, J.P. (author) other 1997
- document
- Hengst, S. (author), Dirkse, C. (author), de Wilde, J.P. (author) other 1998
- document
- de Wilde, J.P. (author) master thesis 1998
- document
- de Wilde, J.P. (author) master thesis 1998