“The Effect of Urea and Sulphur Level in Mixing of Cassava Waste Fermented and Soybean Cake Waste on Nitrogen Balance and Digestibility of Energy of Local Male Sheep”. Animal Production: Indonesian Journal of Animal Production 3, no. 2 (May 4, 2011). Accessed October 30, 2026. https://jap.fapet.unsoed.ac.id/index.php/JAP/article/view/1036.