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AN ANALYTICAL STUDY FOR DEVELOPMENT AND VALIDATION OF METHOD FOR ESTIMATION OF TOTAL BENZALKONIUM CHLORIDE CONTENT AS A PRESERVATIVE IN AZELASTINE HYDROCHLORIDE PHARMACEUTICAL OPHTHALMIC FORMULATION BY REVERSE PHASE LIQUID CHROMATOGRAPHY APPROACH. Int. J. Pharm. Sci. Drug Res. 2017, 9 (5), 268-274. https://doi.org/10.25004/IJPSDR.2017.090512.