SKIBSTED, S. Huler – mere end blot huller i jorden. Varv, [S. l.], v. 1994, n. 1, p. 3–15, 1994. DOI: 10.7146/varv.v1994i1.144323. Disponível em: https://tidsskrift.dk/varv/article/view/144323. Acesso em: 5 jan. 2025.