@inproceedings{sgem2021s05097,
  title = {NEW OPPORTUNITIES FOR ENERGY STORAGE IN BULGARIA - PROMISING HYDROGEN TECHNOLOGIES},
  author = {Efrosima Zaneva-Dobranova and Nikolay Hristov},
  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 = {535-542},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/1.1/s05.097}
}