Genov, Georgi, Borislav Genov, and Anton Antonov. “Justification of Nondestructive Testing”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 1, no. 1 (February 24, 2023): 76–86. Accessed January 26, 2026. https://jsar.ftn.shu.bg/index.php/jsar/article/view/22.