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Manyong, V. ,  Degand, J. ,  [Measurement of the sustainability of African smallholder farming systems: case study of a systems approach] ,  Measurement of the sustainability of African smallholder farming systems: case study of a systems approach

Weber, G. ,  Smith, J. ,  Manyong, V. ,  [System dynamics and the defintion of research domains for the northern Guinea Savanna of West Africa] ,  System dynamics and the defintion of research domains for the northern Guinea Savanna of West Africa