Nayak, C. and Padhi, P. 2018. Preparation and Characterization of Ethyl Cellulose based Salbutamol Sulphate and Theophylline Combination Microsphere. PharmaTutor. 6, 4 (Apr. 2018), 51-69. DOI:https://doi.org/10.29161/PT.v6.i4.2018.51.