AHER, S. S.; GAWALI, J. S.; SAUDAGAR, R. B. UV-Spectrophotometric Estimation of Olopatadine hydrochloride in Bulk and Pharmaceutical Dosage Form by Zero, First and Second Order Derivative Methods. Journal of Drug Delivery and Therapeutics, v. 9, n. 4-s, p. 519-524, 18 ago. 2019.