L. Warly, Suyitman, Evitayani, and A. Fariani, “Nutrient Digestibility and Apparent Bioavailability of Minerals in Beef Cattle Fed with Different Levels of Concentrate and Oil-palm Fronds”, Pak. J. Nutr., vol. 16, no. 3, pp. 131–135, Feb. 2017, doi: 10.3923/pjn.2017.131.135.