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2. Tolansky, S., “Surface Microtopography”Longmans, Green and Co. Ltd., London, England (1960).
3. Post, D., “The Generic Nature of the Absolute Retadation Method of Photoelasticity,”Ibid. 7,6,233–241 (1967).
4. Nisida, M. andSaito, H., “A New Interferometric Method of Two-Dimensional Stress Analysis,”Experimental Mechanics,4,12,366–376 (1964).
5. Rana, M. H., “Application of Multiple-beam Interferometry to Strain Analysis of Rocks,” Proc. Rock Mech Symposium, Univ. Toronto, Published by Mines Branch, Ottawa, 155–182 (January 15–16, 1965).