The Ostsee Issue in the Second Half of the 19th Century. European Scientific e-Journal, [S. l.], n. 5, p. 27–38, 2020. DOI: 10.47451/his2020-12-004. Disponível em: https://journals.eiid.eu/index.php/esej/article/view/142. Acesso em: 26 oct. 2025.