A. A. Hameed, M. Salih, and F. E. Seed, “Effect of Urea Treatment on the Chemical Composition and Rumen Degradability of Groundnut Hull”, Pak. J. Nutr., vol. 11, no. 12, pp. 1146–1151, Nov. 2012, doi: 10.3923/pjn.2012.1146.1151.