Kaya, I., and M. Kamaci. “Synthesis and Characterization of New poly(azomethine-Urethane) and Polyphenol Derivatives Obtained from 3,4-Dihydroxy Benzaldehyde and Hexamethylene Diisocyanate”. Polimery, vol. 56, no. 10, Oct. 2011, pp. 721-33, https://ichp.vot.pl/index.php/p/article/view/962.