A. M. Awadelkareem, G. Muralikrishna, A. EL Tinay, and A. Mustafa, “Characterization of Tannin and Study of in vitro Protein Digestibility and Mineral Profile of Sudanese and Indian Sorghum Cultivars”, Pak. J. Nutr., vol. 8, no. 4, pp. 469–476, Mar. 2009, doi: 10.3923/pjn.2009.469.476.