Tesfaye Alemu, Pornsri Chairatanayuth, Pravee Vijchulata, and Sayan Tudsri. “The Potential of Urea Treated Maize Stover for Growth Performance of Weaned Crossbred Calves”. Agriculture and Natural Resources, vol. 39, no. 4, Dec. 2005, pp. 638-46, https://li01.tci-thaijo.org/index.php/anres/article/view/243412.