“Effects of Slow Release Urea Supplementation of Sheep Protein Source Feed Protected with Condensed Tannin from Leucaena on Protein Degradation in Rumen and Post-rumen In Vitro” (2018) Animal Production: Indonesian Journal of Animal Production, 19(2), pp. 119–126. doi:10.20884/1.jap.2017.19.2.624.