R. Nagaraju, Kaza R. Formulation and Evaluation of Bilayer Sustained Release Tablets of Salbutamol and Theophylline. Scopus Indexed [Internet]. 2009 Nov. 30 [cited 2024 Jul. 4];2(3):638-46. Available from: http://ijpsnonline.com/index.php/ijpsn/article/view/632