M. A. Hoque, A. Nakayama, H. Nur, S. Raya, M. Rahman, and S. K. Uddin, “Synthesis and characterization of copoly(L-lactic acid-caprolactone) and its stereo-effect with poly D-lactic acid and biodegradability”, Bangladesh J. Sci. Ind. Res., vol. 47, no. 2, pp. 203–210, Jul. 2012.