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2. International Tables for Crystallography, Volume D, Physical Properties of Crystals, First on-line edition 2006.
3. Hazen, R.M., & Finger, L.W., 1982, Comparative Crystal Chemistry. Temperature, Pressure, Composition and the Variation of Crystal Structure, Wiley: London.
4. Jessen, S.M., & Kueppers, H., 1991, The precision of thermal expansion tensors of triclinic and monoclinic crystals, J. Appl. Cryst., 24, 239–242.
5. Pauling, L., 1939, The Nature of the Chemical Bond, Cornell University Press: Ithaca, New York.