1. O.I. Bodak, E.I. Gladyshevsky, Kristallohimia intermetallicheskih soedinenii redkozemel’nyh metallov, Lviv, ‘Vischa Shkola’, 1982, 153 (in Russian).
2. Pearson’s Handbook of Crystallographic Data for Intermetallic Phases, Vol. 3. American Society for Metals, Metals Park, OH, 1985.
3. The Rietveld Method;Izumi,1993