BERTHELSEN, Asger. En hatformet bakke. Varv, [S. l.], v. 1980, n. 3, p. 82–88, 1980. DOI: 10.7146/varv.v1980i3.148061. Disponível em: https://tidsskrift.dk/varv/article/view/148061. Acesso em: 6 dec. 2025.