PETERSEN, Kaj Strand. Geologiske billeder fra Rügen-Fehmarn. Varv, [S. l.], v. 1974, n. 2, p. 43–46, 1974. DOI: 10.7146/varv.v1974i2.150711. Disponível em: https://tidsskrift.dk/varv/article/view/150711. Acesso em: 6 dec. 2025.