Khan, F., M. S. M. I. Razzak, M. Z. R. Khan, K. R. Azam, S. M. A. Sadat, and M. S. Reza. “Preparation and <i>In vitro</I> Evaluation of Theophylline Loaded Gastroretentive Floating Tablets of METHOCEL K4M”. Dhaka University Journal of Pharmaceutical Sciences, vol. 7, no. 1, Oct. 2008, pp. 65-70, doi:10.3329/dujps.v7i1.1220.