1. Bacquet, G., Dugas, J., Escribe, C., Gaite, J.M., Michoulier, J.: Comparative electron paramagnetic resonance study of Fe3+ and Gd3+ ions in monoclinic zirconia. J. Phys. C Solid State Phys. 7, 1551 (1974)
2. Birle, J.D., Gibbs, G.V., Moore, P.B., Smith, J.V.: Crystal structures of natural olivines. Am. Mineral. 53, 807 (1968)
3. Buckmaster, H.A., Chatterjee, R., Shing, Y.H.: The application of tensor operators in the analysis of EPR and ENDOR spectra. Phys. Status. Solid. A:13, 9 (1972)
4. Burns, R.G.: Crystal field spectra and evidence of cation ordering in olivine minerals. Am. Mineral. 55, 1608 (1970)
5. Gaite, J.M.: Etude des Propriétés Locales dans les Cristaux de Basse Symétrie à l'Aide de la RPE d'Ions à l'Etat S. Thesis University of Orleans (this part is not published) (1973)