TY JOUR TI PHENOMENON OF FRONTIER CITY: ASTRAKHAN OF XVI-XVII CENTURIES IN EUROPEANS OPINION KW frontier city KW compositions of Europeans about Russia KW East and West KW barbarity KW civilization KW polyethnicity KW multicultural center JO Vestnik of Astrakhan State Technical University AU Shcherbakova, L.. PY 2012 IS 2012 PB Astrakhan State Technical University