@INBOOK {MCHUGH:1991, title = {A maize and groundnuts stepwise trial in the Ndop Plain, Cameroon}, author = {McHugh, D. }, year = {1991}, type = {On-farm research in theory and practice edited by H.J.W. Mutsaers and P. Walker}, pages = {122--127}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }