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. International Journal of Pharmaceutical Sciences and Drug Research, [S. l.], v. 9, n. 5, p. 268–274, 2017. DOI: 10.25004/IJPSDR.2017.090512. Disponível em: https://ijpsdronline.com/index.php/journal/article/view/583.. Acesso em: 24 oct. 2025.