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Ray, K.K., Chakraborty, D. & Ray, S. A comparative analysis of fracture toughness measurements by chevron notched specimens in three and four point bending. Int J Fract 57, R7–R11 (1992). https://doi.org/10.1007/BF00013012
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DOI: https://doi.org/10.1007/BF00013012