1. ISO/TR 9824-1:1990. Measurement of liquid flow in open channels. Part 11: Free surface flow in closed conduits. Part 11A: Methods of measurement. ISO.
2. ISO/TR 9824-2:1990. Measurement of liquid flow in open channels. Part 11: Free surface flow in closed conduits. Part 11B: Specification for performance and installation of equipment for measurement of free surface flow in closed conduits. ISO.
3. Envitech. Missing piece in data jigsaw. Water and Waste Treatment, pp 33–34. March 2002.
4. D. Fearnside. “Shoebox” helps save £1m. Wet News. August 2001.
5. Discharge measurement using portable dilution gauging flowmeters;Butterworth;CIWEM Journal,2000