International
Tables for Crystallography Volume D Physical properties of crystals Edited by A. Authier © International Union of Crystallography 2013 
International Tables for Crystallography (2013). Vol. D, ch. 3.4, p. 539
Section 3.4.5. Glossary^{a}Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, CZ18221 Prague 8, Czech Republic, and ^{b}Department of Mathematics and Didactics of Mathematics, Technical University of Liberec, Hálkova 6, 461 17 Liberec 1, Czech Republic 
Note: the correspondence between contracted Greek indices and the Cartesian vector components used in Sections 3.1.3 , in the present chapter and in the software GIKoBo1, is defined in the following way:
In this designation, coefficients with contracted indices 4, 5, 6 appear two times, e.g. index 4 replaces yz in one coefficient and zy in the other coefficient. With this convention, the coefficients transform in tensor space as vector components, but some coefficients differ from the usual matrix notation (Voigt matrices) by numerical factors [see Section 1.1.4.10 ; Nye (1985); Sirotin & Shaskolskaya, Appendix E (1982)].
(a) Objects

(b) Symmetry groups – point groups in a continuum description and space groups in a microscopic description

(c) Components of property tensors
References
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Sirotin, Yu. I. & Shaskolskaya, M. P. (1982). Fundamentals of Crystal Physics. Moscow: Mir.