TY JOUR TI BIOLOGICAL ACTIVITY OF SEAGRASS AND VARIABILITY OF ACOUSTIC PROPERTIES OF THE BOTTOM LAYER OF THE SHALLOW SEA KW dispersion of sound speed KW gassy saturated marine sediments KW attenuation coefficient JO Russian Journal of Biological Physics and Chemisrty AU Lastovenko, O.R. AU Lisyutin, V.A. PY 2019 IS 4 PB Federal State Educational Institution of Higher Education Sevastopol State University