F. Llana D, Íñiguez-González G, Díez MR, Arriaga F. Nondestructive testing used on timber in spain: A literature review. Maderas-Cienc Tecnol. 2020;22(2):133-156. Accessed November 12, 2026. https://revistas.ubiobio.cl/index.php/MCT/article/view/3929