Gebreyohannes, G., S. Koonawootrittriron, . M. A. . Elzo, and T. . Suwanasopee. “Fitness of Lactation Curve Functions to Daily and Monthly Test-Day Milk Data in an Ethiopian Multi-Breed Dairy Cattle Population”. Agriculture and Natural Resources, vol. 47, no. 1, Feb. 2013, pp. 60-73, https://li01.tci-thaijo.org/index.php/anres/article/view/243029.