@inproceedings{sgem2009paper,
  title = {ECOLOGICAL PROBLEM AT THE “RIVER – BRIDGE” CROSSPOINT},
  author = {N. Zhechev},
  booktitle = {9th International Multidisciplinary Scientific GeoConference SGEM2009},
  year = {2009},
  pages = {503-508},
  publisher = {SGEM Scientific GeoConference},
  doi = {}
}