VIBERG, A. The Big Five. Mapping the subsurface of Iron Age forts on the Island of Öland, Sweden. Archaeologia Polona, [S. l.], v. 53, p. 521–252, 2015. Disponível em: https://journals.iaepan.pl/apolona/article/view/391. Acesso em: 4 may. 2024.