LECH, Aleksandra. Horizontal aid in the European Union. Comparative Economic Research. Central and Eastern Europe, Poland, v. 11, n. 1-2, p. 71–87, 2008. DOI: 10.18778/1508-2008.11.05. Disponível em: https://www.czasopisma.uni.lodz.pl/CER/article/view/21525. Acesso em: 8 aug. 2026.