- document
- Hoekstra, B. (author) doctoral thesis 1978
- document
- Van de Vaart, H. (author) doctoral thesis 1969
- document
- Van der Pauw, L.J. (author) doctoral thesis 1968
- document
- Penning, P. (author) doctoral thesis 1966
- document
- Baelde, A. (author) doctoral thesis 1964