“ Effect of Alkali Lignin on Heat of Fusion, Crystallinity and melting points of Low density polyethylene(LDPE), Meduim density polyethylene(MDPE) and High density polyethylene(HDPE)”, UTJsci, vol. 2, no. 2, pp. 89–95, Apr. 2010, Accessed: May 17, 2024. [Online]. Available: http://jsci.utq.edu.iq/index.php/main/article/view/354