Бабак, В. П, С. Ф. Филоненко, and М. Кришан. “Digital Analysis for Studying the Acoustic Properties of Materials”. Proceedings of National Aviation University 3, no. 2 (September 26, 1999): 133–137. Accessed November 22, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/9390.