O. Adebiyi, A. Ologhobo, and A. Agboola, “Effects of Microbial Phytase Supplementation on Mineral Composition of Tibia and Mineral Utilization in Broiler Fed Maize - Based Diets”, Int. J. Poult. Sci., vol. 8, no. 6, pp. 570–573, May 2009, doi: 10.3923/ijps.2009.570.573.