Theera Rukkwamsuk, Narongpol Petploi, Ing-orn Preechanvinit, and Prapassorn Jongmepornsirisopa. “Effect of Oral Administration of Propylene Glycol on Serum Glucose Concentrations in Periparturient Dairy Cows”. Agriculture and Natural Resources, vol. 37, no. 2, June 2003, pp. 145-9, https://li01.tci-thaijo.org/index.php/anres/article/view/242855.