PEDERSEN, Frank D. Sorte Engel. Varv, [S. l.], v. 1978, n. 2, p. 52–64, 1978. DOI: 10.7146/varv.v1978i2.149515. Disponível em: https://tidsskrift.dk/varv/article/view/149515. Acesso em: 7 dec. 2025.