Perveen, Rawshan Ara, and Md. Sayedur Rahman. “Strength, Efficacy and Tolerability of Morphine Solution With and Without Added Preservatives: A Comparative Study”. Bangladesh Journal of Pharmacology 10, no. 1 (February 18, 2015): 116–124. Accessed April 25, 2024. https://www.banglajol.info/index.php/BJP/article/view/21754.