Febrina, Dewi, Novirman Jamarun, Mardiati Zain, and Khasrad. 2016. “The Effects of P, S and Mg Supplementation of Oil Palm Fronds Fermented by Phanerochaete Chrysosporium on Rumen Fluid Characteristics and Microbial Protein Synthesis”. Pakistan Journal of Nutrition 15 (3): 299–304. https://doi.org/10.3923/pjn.2016.299.304.