AbdullahiAhmed A., GaladimaNura S., and Safiya Sani. 2022. “SEED VIABILITY OF SOME COWPEA CULTIVARS AFFECTED BY SINGLE AND MIXED VIRUS INFECTIONS IN NIGER STATE, NIGERIA”. FUDMA JOURNAL OF SCIENCES 6 (1), 168 -74. https://doi.org/10.33003/fjs-2022-0601-888.