@PROCEEDINGS {AY:1984a, title = {Cowpea variety selection: the user case}, author = {Ay, P. and Kofi Fosu, }, booktitle = {Presented at the First World Cowpea Research Conference, 4-9 November, IITA}, year = {1984}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }