Liszkowska, J. “The Effect of Ground Coffee on the Mechanical and Application Properties of Rigid Polyurethane-Polyisocyanurate Foams”. Polimery 63, no. 4 (January 13, 2021): 305–310. Accessed March 9, 2025. https://polimery.ichp.vot.pl/index.php/p/article/view/211.