- document
- Smits, J.G.C. (author), Stutterheim, E. (author), Vries, D.J. de (author) report 1986
- document
- Stutterheim, E. (author), Smits, J.G.C. (author) report 1985
- document
- Smits, J.G.C. (author) report 1980
- document
- Smits, J.G.C. (author) report 1979