V. M. O. Okoro, U. E. Ogudu, A. B. I. Udedibie, C. L. Okoro, H. O. Ukwu, and S. N. Ibe, “Effect of genotype, sex and parity on growth traits of diallel crossed Nigerian indigenous and exotic pigs”, NJAP, vol. 42, no. 1, pp. 30–41, Dec. 2020.