@ARTICLE {MUTSAERS: 1986, title = {IITA's on-farm/farming systems research program}, author = {Mutsaers, H. J. W. and Palada, M. C. and Vogel, W. A. }, journal = {West African Farming Syetems Research Network Bulleting}, year = {1986}, number = {1}, pages = {4--5}, }