JENSEN, Aage. Historien om jern-titan-oxiderne I. Varv, [S. l.], v. 1994, n. 4, p. 110–115, 1994. DOI: 10.7146/varv.v1994i4.144181. Disponível em: https://tidsskrift.dk/varv/article/view/144181. Acesso em: 25 dec. 2025.