KOREJWO, M. The Boundaries of Friendship, Olsztyn - Kaliningrad, 1956-1989. Echa Przeszłości, [S. l.], n. XV, 2018. DOI: 10.31648/ep.2514. Disponível em: https://czasopisma.uwm.edu.pl/index.php/ep/article/view/2514. Acesso em: 2 oct. 2024.