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harvard.edu
ui.adsabs.harvard.edu
McSkimin, H.J.; Andreatch, P. (1972). “Elastic Moduli of Diamond as a Function of Pressure and Temperature”. J. Appl. Phys. 43 (7): 2944–2948. Bibcode:1972JAP....43.2944M. doi:10.1063/1.1661636.
iupac.org
goldbook.iupac.org
Shear modulus, G. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006)