Danko, M., and J. Mosnáček. “Ring-Opening Polymerization of γ-Butyrolactone and Its Derivatives: A Review”. Polimery 62, no. 4 (January 15, 2021): 272-282. Accessed July 22, 2024. https://ichp.vot.pl/index.php/p/article/view/292.