KAWAŁKO, Bogdan. Selected Problems of Polish-Ukrainian Transborder Cooperation. Regional Barometer. Analyses & Prognoses, [S. l.], n. 2 (24), p. 35–60, 2011. DOI: 10.56583/br.1339. Disponível em: https://czaz.akademiazamojska.edu.pl/index.php/br/article/view/1339. Acesso em: 11 jul. 2025.