@ARTICLE {WILLIAMS:1975a, title = {Disease of cowpea (Vigna unguiculata (L.) Walp)}, author = {Williams, R. J. }, journal = {Pest Articles & News Summaries}, year = {1975}, volume = {21}, number = {3}, pages = {253--267}, issn = {0309-7943}, doi = {10.1080/09670877509411407}, }