D. F. Llana, G. Íñiguez-González, M. R. Díez, and F. Arriaga, “Nondestructive testing used on timber in spain: A literature review”, Maderas-Cienc Tecnol, vol. 22, no. 2, pp. 133–156, Apr. 2020, Accessed: Nov. 12, 2026. [Online]. Available: https://revistas.ubiobio.cl/index.php/MCT/article/view/3929