- document
- Hengst, S. (author), Stijnen, P. (author) other 1986
- document
- Hengst, S. (author), Saurwalt, K.J. (author), Kuijer, M.M.R. (author) master thesis 1984
- document
- van der Harst, C.J. (author), Hengst, S. (author), Saurwalt, K.J. (author) master thesis 1984
- document
- de Haas, J.G.E. (author), Hengst, S. (author), Saurwalt, K.J. (author) master thesis 1984