Stability-indicating RP-HPLC method for simultaneous estimation of levosalbutamol sulfate and theophylline in combined dosage form . Braz. J. Pharm. Sci. [Internet]. 2013 Sep. 1 [cited 2024 Jul. 22];49(3):475-90. Available from: https://journals.usp.br/bjps/article/view/68979