1. US DOE, 2004, “Variable Speed Pumping - A guide to Successful Applications”, US Department Of Energy
2. B.P.M. Van Esch, “Simulation of three-dimensional unsteady flow in hydraulic pumps”, Enschede, Netherlands, 1997
3. UNEP, “Electrical Energy Equipment: Pumps and Pumping Systems”, United Nations Environmental Programme, 2006
4. T.F. Kaiser, R.H. Osman, R.O. Dickau, Analysis Guide for Variable Frequency Drive Operated Centrifugal Pumps, Proceedings of the Twenty-Fourth International Pump Users Symposium, 2008, pp. 81–106
5. Steady and Unsteady Radial Forces for a Centrifugal Pump With Impeller to Tongue Gap Variation