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3. Betser, A. A., andFrocht, M. M., “A Photoelastic Study of Maximum Tensile Stresses in Simply Supported Beams under Central Transverse Impact,”Ibid., 24, No. 4, 509–514 (1957).
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5. Christie, D. G., “An Investigation of Cracks and Stress Waves in Glass and Plastics by High-Speed Photography,”Trans. Soc. Glass Technol., 36, 74–89 (1952).