Gheorghe Amza (2015). CONTRIBUTION REGARDING METAL PIECES RECYCLING BY OXY-GAS FLAME METALLIZATION USING ULTRASONIC ACTIVATION OF THE BASE MATERIAL. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 15th International Multidisciplinary Scientific GeoConference SGEM2015, ENERGY AND CLEAN TECHNOLOGIES. https://doi.org/10.5593/sgem2015/b41/s18.083