Paciorek-Sadowska, J., M. Borowicz, B. Czupryński, and J. Liszkowska. “Composites of Rigid Polyurethane-Polyisocyanurate Foams With Oak Bark”. Polimery, vol. 62, no. 9, Jan. 2021, pp. 666-72, doi:10.14314/polimery.2017.666.