Grzebieniak, K., et al. “Microstructure Transformation Due to Hydrolytic Degradation of Ethylene Terephthalate Lactic Acid Copolyesters”. Polimery, vol. 47, no. 7-8, Sept. 2022, pp. 528-33, https://polimery.ichp.vot.pl/index.php/p/article/view/1997.