@inproceedings{sgem2009paper,
  title = {CLIMATIC CHANGE IN THE STORM OCCURRENCE AND INTENSITY TRENDS},
  author = {N. Valchev and E. Trifonova and N. Andreeva and P. Eftimova},
  booktitle = {9th International Multidisciplinary Scientific GeoConference SGEM2009},
  year = {2009},
  pages = {305-312},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}