Andrejs Cekuls. "THE PROBLEMATIC OF SOCIAL ISSUES AND ENVIRONMENTAL." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Ecology, Economics, Education and Legislation (2018): 927-934. https://doi.org/10.5593/sgem2018/5.3/s28.118