@BOOK {IZAC:1991, title = {A strategy for inland valley agroecosystems research in West and Central Africa: RCMP Research monograph, No. 5}, author = {Izac, A. M. N. and Swift, M. J. and Andriesse, W. }, series = {RCMP Research monograph, No. 5}, year = {1991}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {24p.}, }