Tondi, G., A. Pizzi, and R. Olives. “Natural Tannin-Based Rigid Foams As Insulation for Doors and Wall Panels”. Maderas-Cienc Tecnol, vol. 10, no. 3, Dec. 2014, pp. 219-28, https://revistas.ubiobio.cl/index.php/MCT/article/view/1386.