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mixed cropping
Oduol, Peter A., and J. R. W. Aluma. (1990) 1990. “The Banana (Musa spp.) Coffee Robusta: Traditional Agroforestry System of Uganda”. Agroforestry Systems 11 (3): 213-26. doi:10.1007/BF00045900.
Warren, D. Michael. (1991) 1991. “Indigenous Knowledge and Development (revised Version)”. In . Washington, DC.