SGEM 2019 : 19th international multidisciplinary scientific geoconference SGEM 2019, 30 June - 6 July, 2019, Albena, Bulgaria. 19, Water resources, forest, marine and ocean ecosystems. Hydrology and water resources marine and ocean ecosystems. Sofia : STEP92 Technology, 2019. 764 s. ISBN 978-619-7408-81-2.