Kiaei, M., B. Kord, and R. Vaysi. “Influence of Residual Lignin Content on Physical and Mechanical Properties of Kraft pulp/Pp Composites”. Maderas-Cienc Tecnol, vol. 16, no. 4, Dec. 2014, pp. 495-03, https://revistas.ubiobio.cl/index.php/MCT/article/view/1184.