1) ISO 9300-1990 (E): Measurement of Gas Flow by Means of Critical Flow Venturi Nozzles
2) R. L. Stevens: Development and calibration of the Boeing 18kg/s Airflow Calibration Transfer Standard, Proceedings of International Symposium on Fluid Flow Measurement 80/96 (1986)
3) W. F. Seidl: Primary Calibration of the Boeing 18kg/sec Airflow Calibration Transfer Standrad, ibid, 97/107 (1986)
5) L. Olsen and G. P. Baumgarten: Gas Flow Measurement by Collection Time and Density in a Constant Volume, Proceedings of the First symposium on Flow, Its Measurement and Control in Sicience and Industry, 1287/1295 (1974)