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 December 4, 2024. https://jsar.ftn.shu.bg/index.php/jsar/article/view/22.