1. IEEE Std C57.110-1998 “IEEE Recommended Practice for Establishing Transformer Capability When Supplying Non sinusoidal Load Currents”.
2. Jian Zheng (2000) “Transformer ac winding resistance and derating when supplying harmonic-rich current” “M.Sc. A thesis in electrical engineering in Michigan Technological University”.
3. K.C. Umeh, A. Mohamed, R. Mohamed, (2003) “Determining harmonic characteristics of typical single phase non-linear loads”, Proc. Student Conference on Research and Develoent (SCORED), Putrajaya, Malaysia.
4. Ahd H. Gheeth (2012) “Analysis Of Power Transformers Feeding Variable Frequency”.
5. The impact of harmonic filter locations on distortion suppression