@INBOOK {BLADE:1997, title = {Recent developments in cowpea cropping systems research}, author = {Blade, S. and Shetty, S. V. R. and Terao, T. and Singh, B. }, year = {1997}, type = {Advances in cowpea research}, pages = {114--128}, chapter = {10}, publisher = {International Institute of Tropical Agriculture (IITA); Japan International Research Center for Agricultural Sciences (JIRCAS)}, address = {Ibadan, Nigeria}, }