AbdullahiA. A., GaladimaN. S. and SaniS. (2022) “SEED VIABILITY OF SOME COWPEA CULTIVARS AFFECTED BY SINGLE AND MIXED VIRUS INFECTIONS IN NIGER STATE, NIGERIA”, FUDMA JOURNAL OF SCIENCES, 6(1), pp. 168 - 174. doi: 10.33003/fjs-2022-0601-888.