Duarte, J. P., and P. Peças. “Excimer Laser Cleaning of Mud Stained Paper and Parchment”. Revista de Metalurgia 34, no. 2 (April 30, 1998): 101–103. Accessed April 29, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/669.