Guntekin, E., S. Ozkan, and T. Yilmaz. “Prediction of Bending Properties for Beech Lumber Using Stress Wave Method”. Maderas. Ciencia Y Tecnología, vol. 16, no. 1, Dec. 2014, pp. 93-98, https://revistas.ubiobio.cl/index.php/MCT/article/view/1149.