Hristina Mihaleva. "ECO   MARKETING, ECONOMIC INSTRUMENT FOR SUSTAINABLE ECOLOGICAL POLICY." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 13th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION (2013). https://doi.org/10.5593/sgem2013/be5.v2/s21.010