Chen, Guangmei, Chao Liu, and Dongfeng Hu. “Synthesis by Different Methods and Characterization of Hyperbranched Polyurethane”. Asian Journal of Chemistry 25, no. 10 (May 2, 2013): 5527–5531. Accessed July 17, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_10_60.