M. A. Basher, A. K. L. Kabir, M. M. Hussain, and M. M. A. Al Mamun, “Comparative Evaluation of HPMC, PVA and Gelatin as Matrices for Controlled Release Drug Delivery”, S.J. Pharm. Sci, vol. 2, no. 1, pp. 51–55, Aug. 2010.