Viral Shah, Meha Sharma, Vijay Parmar, & Umesh Upadhyay. (2010). Formulation of sildenafil citrate loaded nasal microsphers: An in vitro, ex vivo characterization. International Journal of Drug Delivery, 2(3), 213–220. Retrieved from https://ijdd.arjournals.org/index.php/ijdd/article/view/31