- document
- Doorduin, J.P. (author), Stijnen, P. (author), Hengst, S. (author) master thesis 1984
- document
- van der Vleuten, P.B.J. (author) master thesis 1987
- document
- van Oostveen, D.C. (author), Hengst, S. (author) master thesis 1990
- document
- Hengst, S. (author), Saurwalt, K.J. (author) other 1986
- document
- Hengst, S. (author) other 1990