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Cotterman, B.W., Stern, F.B. Crack-defect Demonstrator. Exp Tech 7, 40–41 (1983). https://doi.org/10.1111/j.1747-1567.1983.tb01685.x
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DOI: https://doi.org/10.1111/j.1747-1567.1983.tb01685.x