FRIEDERICHSEN, J. D.; BENGAARD, H.-J. Store rullesten. Varv, [S. l.], v. 1986, n. 2, p. 58–52, 1986. DOI: 10.7146/varv.v1986i2.144964. Disponível em: https://tidsskrift.dk/varv/article/view/144964. Acesso em: 6 dec. 2025.