HEPPNER, H. Focas, Spiridon: The Lower Danube River in the Southeastern European Political and Economic Complex from Antiquity to the Conference of 1948. Südost-Forschungen, [S. l.], v. 1, n. 1, p. 312–313, 2021. Disponível em: https://www.suedost-forschungen.de/portal/index.php/sof/article/view/8212. Acesso em: 1 mai. 2025.