García, Diego Juan, Luis Javier Lozano Blanco, and María Dolores Mulero Vivancos. 2001. “Leaching of Vanadium from Sulphuric Acid Manufacture Spent Catalysts”. Revista De Metalurgia 37 (1):18-23. https://doi.org/10.3989/revmetalm.2001.v37.i1.437.