1. Abramowitz, M. and Stegun, I.A. Handbook of mathematical functions Dover ,9th Edn, ISBN 0-486-61272-4.
2. Ultrasonics as a standard for volumetric flow measurement;Fisher,1971
3. Survey of pipeline flowmeters;Brain,1983
4. British Patent No 1503 852: Fluid flow measurement system for pipes. Filed by Westinghouse Electric Corp. (1978)
5. Extension of numerical quadrature formulae to cater for end point singular behaviours over finite intervals;Harris;Intern. J. Computer Math.,1977