Bakr, M. A., S. Khatun, and M. A. Islam. “DRUG RELEASE PROFILE OF MALIC ACID-PHTHALIC ACID BUTANE 1,4-DIOL COPOLYESTER”. Biological Sciences - PJSIR, vol. 47, no. 4, Aug. 2004, pp. 251-5, https://v2.pjsir.org/index.php/biological-sciences/article/view/1529.