1. Karna S, Chaturvedi S, Agrawal V, Alim M. Formulation approaches for sustained release dosage forms : a review. Asian J Pharm Clin Res. 2015;8:46–53.
2. Garg R, Gupta GD. Progress in controlled gastroretentive delivery systems. Trop J Pharm Res. 2008;7:1055–66.
3. Isha C, Nimrata S, Rana A, Surbhi G. Oral sustained release drug delivery system: an overview. Int Res J Pharm. 2012;3:57–62.
4. Lopes CM, Bettencourt C, Rossi A, Buttini F, Barata P. Overview on gastroretentive drug delivery systems for improving drug bioavailability. Int J Pharm Elsevier BV. 2016;510:144–58.
5. Arunkumar N, Rani C, Mohanraj KP. Formulation and in vitro evaluation of oral floating tablets of atorvastatin calcium. Res J Pharm Tech. 2008;1:492–5.