PERJU, M. C.; NEJNERU, C.; RAILEANU, T.; AXINTE, M.; HOPULELE, I. Hardening of the Grey Cast Iron through the Vibrating Electrode Method Using a WC Electrode and in Combination with TiC and Ti Electrode. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, v. 31, n. 1, p. 55-59, 15 maio 2008.