Khairiyah, A. N., Sugandi, G., & Kurniadi, D. (2023). Design and Characterization of Ultrasonic Langevin Transducer 20 kHz Using a Stepped Horn Front-Mass. Journal of Engineering and Technological Sciences, 55(4), 357-372. https://doi.org/10.5614/j.eng.technol.sci.2023.55.4.1