TY JOUR TI FRUIT AND BERRY SUPPLY TO REGIONAL POPULATIONS: A CLUSTER APPROACH KW fruit and berry availability KW regional disparities KW cluster analysis KW food security JO Vestnik of Kazan State Agrarian University AU Suglobov, A.E. AU Mayorova, E.A. AU Lyasnikov, N.V. AU Abramov, E.E. AU Dzhikiya, M.K. PY 2026 IS 20 PB Kazan state agrarian University