LARSEN, Ole. I krystallernes verden 2. Varv, [S. l.], v. 1976, n. 1, p. 23–29, 1976. DOI: 10.7146/varv.v1976i1.150203. Disponível em: https://tidsskrift.dk/varv/article/view/150203. Acesso em: 6 dec. 2025.