1. Rules 28–64 on: “Measuring the flows of liquids, gases, and vapors by means of standard diaphragms and nozzles,” Standartov, Moscow (1964).
2. P. B. Kremlevskii, Flowmeters and Quantity Counters [in Russian], Mashinostroenie, Leningrad (1975).
3. W. Wasiluk and W. Krzyzanowski, Polish Peoples Republic Patent Number 55077 (1968).
4. W. Koennecke, Forschung, No. 9 (1938).
5. O. Burke, BWK, No. 8 (1972).