@MISC {Williams:1975k, title = {Screening cowpeas for resistance to cowpea virus: paper presented at the Fifth Annual Conference of the Nigerian Society for Plant Protection, Institute of Agricultural Research, Samaru, Nigeria, March 3-5, 1975}, author = {Williams, R. J. }, year = {1975}, month = {March}, howpublished = {NSPP abstracts; 1972-1975: occasional publication number 1 of the Nigerian Society for Plant Protection. p. 28}, }