A. Olayinka, A. Kolawole, and C. Ilori, “Assessment of variation in the agronomic traits of wild cowpea (Vigna unguiculata (L.) Walp.) subspecies under a rainforest agro-ecology in Nigeria”, GSC Biol. Pharm. Sci., vol. 11, no. 3, pp. 244–253, Jun. 2020.