@PROCEEDINGS {NG:1984b, title = {Cowpea origin, diversity, taxonomy and germplasm}, author = {Ng, N. Q. and Marechal, R. }, booktitle = {Presented at the First World Cowpea Research Conference, 4-9 November}, year = {1984}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }