Songsak Chumpawadee, Kritapon Sommart, Thevin Vongpralub, and Virote Pattarajinda, “In sacco Degradation Characteristics of Crop Residues and Selected Roughages in Brahman-Thai Native Crossbred Steers”, Agr. Nat. Resour., vol. 40, no. 1, pp. 204–214, Feb. 2006.