MUC, S., & GUDRA, T. (2013). Transmission of Ultrasonic Waves Via Optical Silica Glass Fiber Doped by 7.5% of TiO2 with the Use of Power Sandwich Transducer. Archives of Acoustics, 36(1), 141–150. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/202