1. Bezuidenhout, S.R., 2001. Allelopathic effect of the weed Cyperus esculentus on the growth of young Pinus patula plantations. MSc. Dissertation. University of Pretoria.
2. Weed control by spring cover crops and imazetharpyr in no-till southern pea (Vigna unguiculata);Burgos;Weed Technol.,1996
3. Effect of crop density on competition by wheat and barley with Agrostemma githago and other weeds;Doll;Weed Res.,1995
4. Appropriateness of non-destructive measures of young pine tree performance in weeding experiments;Eccles;South. Afr. For. J.,1997
5. Allelopathy: a potential cause of forest regeneration failure;Fisher,1987