TY JOUR TI DIFFERENTIATION OF DEVELOPMENT OF RURAL SUBREGIONS IN THE REGIONAL ECONOMIC SPACE KW subregion KW rural area KW economic space of the region KW assessment of differentiation KW spatial imbalances KW national projects JO Vestnik of Kazan State Agrarian University AU Koroleva, E.N. AU Mustafina, L.A. PY 2025 IS 20 PB Kazan state agrarian University