@proceedings{sgem201954,
  title = {19th International Multidisciplinary Scientific GeoConference SGEM 2019, Ecology, Environmental Economics, Education, and Legislation, Vol. 19, Issue 5.4},
  author = {International authors},
  year = {2019},
  publisher = {STEF92 Technology},
  isbn = {},
  doi = {10.5593/sgem2019/5.4}
}