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3. Frost & Sullivan, 2011. World Nondestructive Test Inspection Services Market, An Indestructible Future, N94C-30
4. IAEA, 2017. Nuclear Technology Review 2017, International Atomic Energy Agency, Vienna
5. Rummel, W.D. 2014. Nondestructive evaluation – A critical part of structural integrity, 1st Int. Conf. Structural Integrity (ICONS-2014), Kalpakkam, India.