Rakwatin, C. ., D. . Nitysuddi, L. . Premjit, R. . Kovithvattanaphong, Y. . Wattanapisit, and O. . Tanunkat. “Survey on Stability of Pharmaceutical Products in National List of Essential Drugs Used in Hospitals in Thailand”. Siriraj Medical Journal, vol. 51, no. 4, Apr. 1999, pp. 262-83, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/246985.