POULSEN, V. Tiderne skifter. Devon. Varv, [S. l.], v. 1965, n. 1, p. 30, 1965. DOI: 10.7146/varv.v1965i1.151810. Disponível em: https://tidsskrift.dk/varv/article/view/151810. Acesso em: 8 jan. 2025.