Ruble, M.K. et al. 2018. Observation of the Improvement in Nocturnal Asthma Symptoms with Administration of Once Daily Sustained Released Theophylline. Journal of Shaheed Suhrawardy Medical College. 9, 2 (Jul. 2018), 74–77. DOI:https://doi.org/10.3329/jssmc.v9i2.37267.