K. G. Witthaus
- Lessons to be learned from deep gold mining in South Africa. Présenté pendant: 11th IABSE Congress, Vienna, Austria, 31 August - 5 September 1980. (1980):
- Problem of more effective feedback to learn from success and failure. Dans: IABSE Journal, v. 7 ( 1983). (1983):
- Choosing a CAD system for an engineering firm in South Africa. Dans: IABSE Proceedings, v. 8 ( 1984). (1984):