Lubczak, J., and B. Łukasiewicz. 2012. “Oligoetherols and Polyurethane Foams With 1,3,5-Triazine Ring and Boron Atoms”. Polimery 57 (11-12):819-29. https://polimery.ichp.vot.pl/index.php/p/article/view/878.