SGEM 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. -- 10.5593/sgem2019/3.1.