Filip, D., et al. “Multiblock Segmented Polyurethanes and Polyurethane-Ureas Based on poly(ethylene Oxide) poly(propylene Oxide) Poly(ethylene Oxide) Macrodiols. Synthesis and Characterization”. Polimery, vol. 55, no. 5, May 2010, pp. 358-65, https://polimery.ichp.vot.pl/index.php/p/article/view/1016.