JØRGENSEN, O. Mandelsten – en mineralogisk plumkage. Varv, [S. l.], v. 1968, n. 4, p. 107–110, 1968. DOI: 10.7146/varv.v1968i4.151342. Disponível em: https://tidsskrift.dk/varv/article/view/151342. Acesso em: 8 jan. 2025.