@inproceedings{sgem2021s21085,
  title = {ENVIRONMENTAL QUALITY AT REGIONAL LEVEL: THE CASE STUDY OF BULGARIA},
  author = {Ivaylo Ivanov},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Ecology, Economics, Education and Legislation},
  year = {2021},
  pages = {383-390},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/5.1/s21.085}
}