MORAWIEC, Jakub. Jarl Sigvaldi and the battle of Svoldr in saga tradition. Folia Scandinavica Posnaniensia, [S. l.], v. 10, p. 69–90, 2009. Disponível em: https://pressto.amu.edu.pl/index.php/fsp/article/view/3570. Acesso em: 25 apr. 2024.