Kwiatkowski, K., and Z. Rosłaniec. “Study of Welding of poly(ether-Ester) Elastomers. Part I. Influence of Contents of Flexible Segments on Morphology and Mechanical Properties”. Polimery, vol. 49, no. 4, Sept. 2022, pp. 268-74, https://polimery.ichp.vot.pl/index.php/p/article/view/1750.