[8] Cotter-howell J D,Champness P E,Charnock J M,et al. European Journal of Soil Science,1994,45(4),393.
[10] Mahapatra P P,Sarangi D S,Mishra B. Journal of Solid State Chemistry,1995,116(1),8.
[11] Fitzer Erich. High Temperature-High Pressures,1987,19(5),573