Warangkana Kitpipit, Panwadee Sopannarath, Sayan Buaban, and Sornthep Tumwasorn, “Comparison of Five Mathematical Functions for Prediction of Monthly Yield in Thai Multibreed Dairy Cattle Population”, Agr. Nat. Resour., vol. 42, no. 2, pp. 246–255, Jun. 2008.