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Ivaylo Ivanov. ENVIRONMENTAL QUALITY AT REGIONAL LEVEL: THE CASE STUDY OF BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation, 2021, pp. 383-390. https://doi.org/10.5593/sgem2021/5.1/s21.085
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Ivaylo Ivanov. ENVIRONMENTAL QUALITY AT REGIONAL LEVEL: THE CASE STUDY OF BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation, 2021, pp. 383-390. https://doi.org/10.5593/sgem2021/5.1/s21.085