García-Heras, M., E. González-Mena, and M. A. Villegas. “Superficial Modification of Aluminium-Base Alloys (anodising and Non-Anodising) by Silica Coating”. Revista De Metalurgia, vol. 40, no. 2, Apr. 2004, pp. 127-31, doi:10.3989/revmetalm.2004.v40.i2.253.