Gill, Charansingh H., et al. “A Study of Method Development and Validation for Estimation of Azelastine Hydrochloride in Nasal Spray Formulations by RP-HPLC Method: A STUDY OF METHOD DEVELOPMENT AND VALIDATION FOR ESTIMATION OF AZELASTINE HYDROCHLORIDE”. Journal of Drug Delivery and Therapeutics, vol. 8, no. 6-s, Dec. 2018, pp. 236-40, https://doi.org/10.22270/jddt.v8i6-s.2222.