DALL’AGLIO, Francesco. Rex or Imperator? Kalojan’s Royal Title in the Correspondence with Innocent III. Studia Ceranea, [S. l.], v. 9, p. 171–185, 2019. DOI: 10.18778/2084-140X.09.10. Disponível em: https://czasopisma.uni.lodz.pl/sceranea/article/view/6651. Acesso em: 3 jul. 2024.