Pisula, W., J. Pigłowski, and C. Kummerlöwe. 2022. “Preparation and Characterization of Copolyesters of poly(tetramethylene Succinate) and poly(butylene Terephthalate)”. Polimery 51 (5):341-50. https://polimery.ichp.vot.pl/index.php/p/article/view/1531.