TY JOUR TI Patterns of formation and development of the customs tariff of the Republic of Tajikistan KW customs tariff KW customs duty KW weighted average rate KW customs and tariff regulation KW foreign trade activity KW Eurasian integration KW Unified customs tariff KW unification KW commodity nomenclature KW trade barriers JO Russian Journal of Management AU Jurabekzoda, E.T. PY 2021 IS 9 PB Publishing Center RIOR