S, Vijaya, Rajyalakshmi N, and Ramanath B. “A Comparative Study of Safety and Efficacy of Tiotropium Bromide With Salbutamol in Moderate Persistent Bronchial Asthma in a Tertiary Care Hospital”. International Journal of Research in Medical Sciences 2, no. 4 (January 26, 2017): 1479–1482. Accessed April 29, 2024. https://www.msjonline.org/index.php/ijrms/article/view/2444.