TY JOUR TI The role of fluids in the chemical composition of the upper holocene sediment layer in the russian sector of the South-East Baltic KW South-East Baltic KW bottom sediments KW cluster analysis KW groundwater JO Russian Journal of Earth Sciences AU Krek, A.. AU Krechik, V.. AU Danchenkov, A.. AU Mikhnevich, G.. PY 2020 IS 20 PB Geophysical Center of the Russian Academy of Sciences