@BOOK {MUTSAERS:1991b, title = {Opportunities for second cropping in southwestern Nigeria; trials and farmer tests with maize, soybeans and cowpeas in Alabata and Ayepe (1985-1989): RCMP research monograph, No. 4}, author = {Mutsaers, H. J. W. }, booktitle = {RCMP research monograph, No. 4}, year = {1991}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {29p.}, }