Riaz, Tauheeda, Muhammad Ikram Aujla, Muhammad Akram Kashmiri, Tayyaba Shahzadi, Amina Asghar, and Tariq Ismail. 2011. “Synthesis and Characterization of Polylactic Acid”. Asian Journal of Chemistry 23 (7):3140-42. https://asianpubs.org/index.php/ajchem/article/view/10618.