Czech-Polak, J., R. Oliwa, M. Oleksy, and G. Budzik. “Rigid Polyurethane Foams With Improved Flame Resistance”. Polimery 63, no. 2 (January 13, 2021): 115-124. Accessed June 29, 2022. https://ichp.vot.pl/index.php/p/article/view/191.