YOCHELSON, Ellis L. The Early Ordovician gastropod Ceratopea from East Greenland. Meddelelser om Grønland, [S. l.], v. 164, n. 7, p. 1–12, 1964. Disponível em: https://tidsskrift.dk/meddrgroenland/article/view/160930. Acesso em: 29 dec. 2025.