TY JOUR TI PEAR BREEDING (PYRUS L.) MODERN ACHIEVEMENTS AND DIRECTIONS IN RUSSIA (review) KW pear KW variety KW sorting KW selection KW directions KW methods JO Bulletin of KSAU AU Svistunova, N.Y. AU Burmenko, Y.V. PY 2022 IS 0 PB Krasnoyarsk State Agrarian University