D. O. Olayemi, M. M. Onakpa, and O. C. Jegede, “Egg Hatch Assay and Lavicidal Activity of Piliostigma Thoningii Pod Extract and Fractions on Haemonchus contortus”, Tanz Vet J, vol. 35, no. 1, pp. 52–62, Mar. 2020.