1. P. W. Bridgman, Rev. Mod. Phys. 7, 1 (1935).
2. G. N. Lewis and G. E. Gibson, J. Am. Chem. Soc. 42, 1529 (1920).
3. O. L. Anderson, Equations of State of Solids for Geophysics and Ceramic Science, Vol. 31 of Monographs on Geology and Geophysics (Oxford Univ. Press, New York, Oxford, 1995), p. 405.
4. U. Ponkratz and W. B. Holzapfel, J. Phys.: Condens. Matter 16, 963 (2004).
5. F. D. Stacey, Rep. Prog. Phys. 68, 341 (2005).