SOKOŁOWICZ, Mariusz E.; LISHCHYNSKYY, Ihor. Are Poland and Ukraine Gravity Centres for Each Other? Study on the Labour Migration Patterns. Comparative Economic Research. Central and Eastern Europe, [S. l.], v. 21, n. 1, p. 45–65, 2018. DOI: 10.2478/cer-2018-0003. Disponível em: https://czasopisma.uni.lodz.pl/CER/article/view/2963. Acesso em: 6 dec. 2025.