Kolasani, Bhanu P., Raghunandan Mudium, and Sudheer Diyya. “Indacaterol and Salmeterol in COPD Patients: a Comparative Study of Efficacy and Safety”. International Journal of Basic & Clinical Pharmacology 2, no. 4 (January 31, 2017): 421–427. Accessed October 24, 2025. https://www.ijbcp.com/index.php/ijbcp/article/view/1293.