- document
- Vugts, Jan H. (author), Harland, L.A. (author) report 1997
- document
- Beckers, J. (author) report 1987
- document
- Korteweg, J.A. (author) report 1986
- document
- Odland, Jonas (author) report 1982
- document
- Moan, Torgeir (author) report 1976
- document
- Koelbel, Joseph G. (author) report 1971
- document
- Simiu, E. (author) report