@ARTICLE {WILLIAMS:1977b,
title = {Identification of multiple disease resistance in cowpea},
author = {Williams, R. J. },
journal = {Tropical Agriculture},
year = {1977},
volume = {54},
number = {1},
pages = {53--59},
issn = {0041-3216},
url = {http://oar.icrisat.org/8335/},
}