- document
- Hengst, S. (author), Soonieus, F.H. (author), Vermeulen, M.C.H. (author) master thesis 1988
- document
- Hengst, S. (author), Koele, J.W. (author), Stijnen, P. (author) master thesis 1987
- document
- Hengst, S. (author), Stijnen, P. (author), Baerveldt, A.J. (author) master thesis 1987