TY CONF TI NATURAL CONDITIONS OF BOTTOM SILTS FORMATION FROM THE AZOV SEA AND BIOGAS PRODUCTIVITY KW productivity JO XXIV International Coastal Conference "SEA COASTS – EVOLUTION, ECOLOGY, ECONOMY" AU Ryazancev, G.B. AU Mnacakanyan, V.G. AU Haskov, M.A. AU Shipilova, L.M. PY 2024 PB Academus Publishing