M. S. Nazeer, T. N. Pasha, S. Abbas, and Z. Ali, “Effect of Yucca Saponin on Urease Activity and Development of Ascites in Broiler Chickens”, Int. J. Poult. Sci., vol. 1, no. 6, pp. 174–178, Oct. 2002, doi: 10.3923/ijps.2002.174.178.