Frías, C., and O. Pérez. “Acids and Metals Recovery from Spent Pickling Baths of Stainless Steels”. Revista de Metalurgia 34, no. Extra (May 30, 1998): 427–431. Accessed April 24, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/786.