1. Spectrochemical determination of thorium in monszite by the powder-d.c. arc technique;Dutra;Spectrochim. Acta,1954
2. Geochemical association of niobium and titanium;Fleischer;U.S. Geol. Survey Circular,1952
3. The cerium minerals of Bastnas at Riddarhyttan Sveriges Geol. Undersökning 1921;Geijer;Arsbok,1921
4. Deposits of radioactive cerite near Jamestown, Colorado;Goddard;Amer. Mineral.,1940