TY JOUR TI ECONOMIC APPROACH TO THE CHOICE OF TARGET WOOD SPECIES FOR THE FOREST GROWING IN KAMA REGION OF THE REPUBLIC OF TATARSTAN KW wood stands KW productivity KW cost KW dynamics KW mathematical models KW optimization. JO Vestnik of Kazan State Agrarian University AU Puryaev, A.. AU Miftakhov , T.. AU Demakov, Y.P. PY 2017 IS 11 PB Kazan state agrarian University