Makchay, P., Kajorncheappunngam, S., & Holasut, K. (2014). Property of polylactic acid synthesized from 85% lactic acid via direct condensation polymerization. Engineering and Applied Science Research, 40(2), 237–245. retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/19104