M. A. Iyere, M. A. Bamikole, U. J. Ikhatua, O. J. Babayemi, and G. S. Egigba, “Effect of some medicinal herbs and spices from Enugu and Kaduna States, Nigeria, on in-vitro rumen fermentation and methanogenesis”, NJAP, vol. 46, no. 2, pp. 241–257, Dec. 2020.