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Schmidt, G and Frey, E (1990) Importance of Rotation with Groundnut for Cereal Productivity. In: Proceedings of the Fourth Regional Groundnut Workshop for Southern Africa, 19-23 March, 1990, Arusha, Tanzania.
Hildebrand, G L and Schmidt, G and Singh, L and Subrahmanyam, P and Wightman, J A and Abraham, J J (1990) Proceedings of the 4th Regional Groundnut Workshop for Southern Africa, Arusha, Tanzania, 19-23 Mar 1990. International Crops Research Institute for the Semi-Arid Tropics. ISBN 9290661879
Schmidt, G and Frey, E (1990) Importance of Rotation with Groundnut for Cereal Productivity. In: Proceedings of the Fourth Regional Groundnut Workshop for Southern Africa, 19-23 March, 1990, Arusha, Tanzania.