Aher, S. S., Gawali, J. S. and Saudagar, R. B. (2019) “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, 9(4-s), pp. 519-524. doi: 10.22270/jddt.v9i4-s.3378.