Aher, Smita. S., Jayshree S. Gawali, and Ravindranath B. Saudagar. 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), 519-24. https://doi.org/10.22270/jddt.v9i4-s.3378.