Arora, Kunal, Sumita Singh, and Lovely Chaurasia. “Ophthalmic Drug Delivery System-A Concise Review on Its Conventional and Novel Approaches”. Current Research in Pharmaceutical Sciences 8, no. 4 (January 8, 2019): 263-269. Accessed February 23, 2020. http://crpsonline.com/index.php/crps/article/view/2.