GUDRA, Tadeusz, and Sylwia MUC. “A Study of Interaction of Ultrasonic and Optical Wave in Optical Fiber Using the Air Gap”. Archives of Acoustics 36, no. 3 (September 30, 2011): 613–628. Accessed March 4, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/168.