TY CONF TI CUSTOMS PAYMENTS IN THE STRUCTURE OF THE ECONOMIC INDICATORS OF THE CUSTOMS BODIES ACTIVITY AND THEIR CURRENT DYNAMICS KW econometric model KW forecasting KW dummy variables KW trend KW customs payments KW import KW export JO Economy of Russia: problems, trends, forecasts AU Tsvil, M.M. AU Krasyukov, D.E. PY 2021 PB AUS PUBLISHERS