@inproceedings{sgem2021s1722,
  title = {TRENDS IN THE DEVELOPMENT OF HYDRO ENERGY IN BULGARIA AFTER 1989},
  author = {Maria Temelkova and Marian Varbanov},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Energy and Clean Technologies},
  year = {2021},
  pages = {111-118},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2021/4.1/s17.22}
}