Jahan, S. T., S. M. A. Sadat, M. S. Islam, R.- ul Jalil, and J. A. Chowdhury. “Effect of Various Excipients on Theophylline-Loaded Alginate Beads Prepared by Ionic Cross Linking Technique”. Dhaka University Journal of Pharmaceutical Sciences, vol. 9, no. 1, Apr. 2011, pp. 15-22, doi:10.3329/dujps.v9i1.7425.