Anton Ivanov, Ivan Georgiev, Nikolay Dimitrov. "ANALYSIS OF SEA LEVEL DATA AT VARNA AND BURGAS TIDE GAUGE STATIONS." SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Informatics, Geoinformatics and Remote Sensing (2020): 3-10. https://doi.org/10.5593/sgem2020/2.2/s09.001