1. Block G. and Jeitschko W., (1987), J. Solid State Chem., 70, 271.
2. Boltich E.B., Ma B.M., Zhang L.Y., Pourarian F., Malik S.K., Sankar S.G. and Wallace W.E., J. Magn. Magn. Mater.
3. Buschow K.H.J., (1988), J. Appl. Phys., 63, 3130.
4. Buschow K.H.J., (1989), J. Magn. Magn. Mater. 80, 1
5. Croat J.J., Herbst J.F., Lee R.W. and Pinkerton F.E., (1984), Appl. Phys. Lett., 44, 148.