TY - CPAPER AU - Eugenia Grecu TI - GREEN ENERGY ALTERNATIVE T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2012 12th International Multidisciplinary Scientific GeoConference PY - 2012 DO - 10.5593/sgem2012/s18.v4007 PB - Stef92 Technology ER -