- document
- Schoeman, P.K. (author) report 2000
- document
- Jeuken, C. (author), Wang, Z.B. (author) report 2000
- document
- Thoolen, P.M.C. (author) report 2000
- document
- Thoolen, P.M.C. (author), Wang, Z.B. (author) report 1999
- document
- Thoolen, P.M.C. (author), Wang, Z.B. (author) report 1999