3) 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)
4) ISO 5816-1978(E): Measurement of Fluid Flow-Estimation of Uncertainty of a Flow-rate Measurement
5) ANSI/ASME PTC 19.6-1985: Supplement of Instruments and Apparatus, Part 1, Measurement Uncertainty