TY JOUR TI HIERARCHY OF URBAN PLANNING COMPOSITIONS OF DIFFERENT SCALES IN THE STRUCTURE OF THE HISTORICAL CENTER OF ST. PETERSBURG KW urban planning structure KW historical center of St. Petersburg KW ensemble KW urban planning composition KW scale KW integrity JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Markushev, S.O. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov