SGEM 2019. 19th International Multidisciplinary Scientific GeoConference. Volume 19. Water Resources. Forest, Marine and Ocean Ecosystems : conference proceedings. Albena, Bulgaria, 30 June - 6 July, 2019. Issue 3.1 Hydrology and Water Resources, Marine and Ocean Ecosystems. 1. vyd. Sofia : STEF 92 Technology, 2019. 764 s. ISBN 978-619-7408-81-2. ISSN 1314-2704.