TY JOUR TI THE FLUCTUATING ASYMMETRY OF THE FLAT-LEAVED BIRCH LEAVES (BETULA PLATYPHYLLA SUKACZ.) AS THE ENVIRONMENT QUALITATIVE CRITERION KW fluctuating asymmetry KW flat-leaved birch (Betula platyphylla Sukacz.) KW leaf plate KW square KW park KW environment quality KW algorithm of the rated difference KW variation degree KW average quadratic deviation JO Bulletin of KSAU AU Nizkii, S.E. AU Sergeeva, A.A. PY 2015 IS PB Krasnoyarsk State Agrarian University