1. Ultrasonic flowmeters: half-century progress report, 1955–2005;Lynnworth;J. Ultrasonics,2006
2. Walsh J T. A report of acoustic transit time accuracy field work performed in North America. In: Fifth international conference on hydraulic efficiency measurements. Lucerne, Switzerland, C. July 2004.
3. ISO 12242-2012 “Measurement of fluid flow in closed conduits — Ultrasonic transit-time meters for liquid”, 2020.
4. IEC 60041 – 1991, “Field acceptance tests to determine the hydraulic performance of hydraulic turbines, storage pumps and pump-turbines”, S. 1991.
5. Analyse und Fehleroptimierung der mehrpfadigen akustischen Durchflussmessung in Wasserkraftanlagen;Alexandre;J. ETH. Zürich.,1999