Brzeska, J., et al. “The Influence of Synthetic Polyhydroxybutyrate on Selected Properties of Novel Polyurethanes for Applications in Medicine. Part II. Polyurethanes Containing Cycloaliphatic Diisocyanates in the Hard Segment”. Polimery, vol. 56, no. 1, Jan. 2011, pp. 27-34, https://polimery.ichp.vot.pl/index.php/p/article/view/888.