1. Xue, B., Hulliger, F., Baerlocher, C., Estermann, M.: J. Alloys Compounds191, L9 (1993)
2. Xue, B., Schwer, H., Hulliger, F.;Acta Crystallogr
C48, 2064 (1992)
3. Hulliger, F.: (unpublished)
4. International Tables for X-ray crystallography, p. 304. Birmingham: The Kynoch Press (1969)
5. Lounasmaa, O.V.: in Hyperfine interactions, p. 468. Freeman, A.J., Frenkel, R.B., (eds.), New York: Academic Press 1967