1. R.D. Shannon and C.T. Prewitt, Acta Crystallogr., B25 (1969) 925.
2. P. Hagenmuller, “Inorganic solid fluorides: Chemistry and Physics”, Academic Press, 1985.
3. J.P. Chaminade, Ph.D. Thesis, University of Bordeaux I, 1974.
4. G. Demazeau, J. Grannec, A. Marbeuf, J. Portier and P. Hagenmuller; C.R. Acad. Sci., 269 (1969) 987.
5. B.L. Chamberland, ‘The crystal chemistry of transition metal oxyfluorides’, in ref (2), p. 205.