@inproceedings{sgem2021s06110,
  title = {DEVELOPMENT AND MODERNIZATION OF NATURAL GAS STORAGE IN BULGARIA},
  author = {Nikolay Hristov and Efrosima Zaneva-Dobranova},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Science and Technologies in Geology, Exploration And Mining},
  year = {2021},
  pages = {609-616},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/1.1/s06.110}
}