Li, X., M. Basso, V. Fierro, A. Pizzi, and A. Celzard. “Chemical Modification of tannin/Furanic Rigid Foams by Isocyanates and Polyurethanes”. Maderas-Cienc Tecnol, vol. 14, no. 3, Dec. 2014, pp. 257-66, https://revistas.ubiobio.cl/index.php/MCT/article/view/1219.