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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., vol. 9, no. 5, pp. 268–274, Sep. 2017, doi: 10.25004/IJPSDR.2017.090512.