Inayat Bashir Pathan, Vijay Chudiwal, Irfan.farooqui, and Prakash Shingare. 2013. “Formulation Design and Evaluation of Nasal in Situ Gel As a Novel Vehicle for Azelastine Hydrochloride”. International Journal of Drug Delivery 5 (3):284-90. https://ijdd.arjournals.org/index.php/ijdd/article/view/207.