PIEKUTOWSKA, Agnieszka; KONOPKA, Paweł. How to measure protectionism in international trade in XXI century? The regional barometer of protectionism – case of Poland. Technological and Economic Development of Economy, [S. l.], v. 29, n. 3, p. 775–795, 2023. DOI: 10.3846/tede.2023.18345. Disponível em: https://btp.vilniustech.lt/index.php/TEDE/article/view/18345. Acesso em: 1 sep. 2025.