Metodi Ivanov. CHALLENGES AND PROBLEMS FOR THE ECONOMY AND ENVIRONMENTAL MANAGEMENT. SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, 2022, pp. 533-540. https://doi.org/10.5593/sgem2022/5.1/s21.067