Conde García, M., J. I. Fernández-Golfín Seco, and E. Hermoso Prieto. “Improving the Prediction of Strength and Rigidity of Structural Timber by Combining Ultrasound Techniques With Visual Grading Parameters”. Materiales de Construcción 57, no. 288 (December 30, 2007): 49–59. Accessed March 29, 2024. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/64.