THE notation is that used by Love, The Mathematical Theory of Elasticity.
Hemp, W.S. (1954), "Fundamental Principles and Methods of Thermo‐Elasticity: Another of the Papers Presented to the Bristol Thermal Stress Conference on January 8,1954, and Summarized in the February Issue", Aircraft Engineering and Aerospace Technology, Vol. 26 No. 4, pp. 126-127. https://doi.org/10.1108/eb032414
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