D. Jucius and B. P. Milius, “Microprocessor-Based Ultrasonic Flowmeter for Investigations of Two-Phase Flows”, ELEKTRON ELEKTROTECH, vol. 20, no. 2, Mar. 1999, Accessed: Jan. 23, 2026. [Online]. Available: https://eejournal.ktu.lt/index.php/elt/article/view/16526