Aballe, A., M. Bethencourt, F. J. Botana, M. Marcos, J. Pérez, and M. A. Rodríguez. “Green Inhibitors. Rare Earth Based Systems”. Revista De Metalurgia, vol. 33, no. 6, Dec. 1997, pp. 363-9, doi:10.3989/revmetalm.1997.v33.i6.770.