Liszkowska, J., B. Czupryński, and J. Paciorek-Sadowska. “Temperature Stability and Thermal Properties of Polyurethane-Polyisocyanurate Foams Obtained Using Products of Citric Acid Condensation”. Polimery, vol. 63, no. 7-8, Jan. 2021, pp. 503-14, doi:10.14314/polimery.2018.7.4.