1. Crystal structure of double oxides of the perovskite type;Megaw;Proc. Phys. Soc.,1946
2. Structure Properties and Preparation of Perovskite Type Compounds;Galasso,1969
3. Multiple ion substitution in perovskite lattice;Roy;J. Am. Ceram. Soc.,1954
4. Crystallographic and Magnetic Properties of Perovskite and Perovskite Related Compounds;Goodenough,1970