Piekutowska, Agnieszka, and Paweł Konopka. “How to Measure Protectionism in International Trade in XXI Century? The Regional Barometer of Protectionism – Case of Poland”. Technological and Economic Development of Economy 29, no. 3 (April 12, 2023): 775–795. Accessed November 2, 2024. https://tede.vgtu.lt/index.php/TEDE/article/view/18345.