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2. R. W. G. Wyckoff: Crystal Structures, Interscience, New York, Vol. II, 2nd edition, 1965.
3. N. N. Greenwood: Ionic Crystals, Lattice Defects, and Nonstoichiometry, Chem. Publ. Co., New York, 1970.
4. A. F. Wells: Structural Inorganic Chemistry, Oxford University Press, 3rd edition, 1962.
5. G. M. Clark: The Structure of Nonmolecular Solids, John Wiley and Sons, New York, 1972.