1. Hydrometry Principles and Practices;Herschy,1998
2. Guide to the expression of uncertainty in measurement, ISO, Geneva, 1995.
3. W. Kirby, USGS. Private communication, 2001-2002.
4. ISO 748, Velocity area methods, International Standards Organization, Geneva, 1997.
5. ISO 1088, Collection of data for determination of errors in measurement by velocity area methods, International Standards Organization, Geneva, 1973. (under revision).