Piekutowska A, Konopka P. How to measure protectionism in international trade in XXI century? The regional barometer of protectionism – case of Poland. TEDE [Internet]. 2023Apr.12 [cited 2024Nov.28];29(3):775–795. Available from: https://mma.vgtu.lt/index.php/TEDE/article/view/18345