Pietrzak, M. and Roman, M. (2018) “THE PROBLEM OF GEOGRAPHICAL DELIMITATION OF AGRI-FOOD MARKETS: EVIDENCE FROM THE BUTTER MARKET IN EUROPEAN UNION”, Acta Scientiarum Polonorum. Oeconomia, 17(3), pp. 85-95. doi: 10.22630/ASPE.2018.17.3.40.