1. D. D. Hogarth, “Classification and Nomenclature of the Pyrochlore Group,” Am. Mineral. 62, 403–410 (1977).
2. L. S. Borodin and I. I. Nazarenko, “Chemical Composition of Pyrochlore and Isomorphic Substitution in the Molecule A2B2X7,” Geokhimiya, No. 4, 278–295 (1957).
3. A. I. Ginzburg, S. A. Gorzhevskaya, E. A. Erofeeva, and G. A. Sidorenko, “On the Chemical Composition of Cubic Titano-Tantaloniobates,” Geokhimiya, No. 5, 486–500 (1958).
4. S. A. Gorzhevskaya, “Cubic Titano-Tantaloniobates. Chemical Composition,” in Geology of Trace Element. Deposits. Vyp. 10. Titano-Tantaloniobates. I. (Gosgeoltekhizdat, Moscow, 1960), pp. 71–84 [in Russian].
5. D. D. Hogarth, “A Study of Pyrochlore and Betafite,” Can. Mineral. 6, 610–633 (1961).