Ecotechnologies – A Major Route for DurableSustainable Development in the Metal Materials Industry - NICOLAE, Avram; DRAGAN, Claudia Ionela; GRADINARU, Catalin Stefan; RUCAI, Valeriu; NICOLAE, Maria (The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2016)