[1] Barry, H., J. Vernon. Non-destructive testing, Macmillan Education LTD, 1988.
[2] Introduction to Nondestructive Testing, 2nd ed., A Training Guide, John Wiley & Sons Inc., 2005, pp. 179-182.
[3] ASM Metals Handbook, 9th ed., ASM Handbook Committee, Gerald L. Anderson, 1989, pp. 104–135.
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