@INBOOK {SINGH:1997j, title = {Increasing productivity of sorghum-cowpea and millet-cowpea intercrops through improved varieties}, author = {Singh, B. and Tabo, R. and Gupta, S. and Ajeigbe, H. }, year = {1997}, type = {Agronomy Abstracts}, pages = {41}, publisher = {American Society of Agronomy}, address = {Madison, WI, USA}, }