1. History of a‐c wave
form, its determination and standardization;Bedell F.;Transactions of the American Institute of Electrical Engineers,1942
2. A history of harmonics in power systems;Owen E. L.;IEEE Industry Applications Magazine,1998
3. Technical origins of 60 Hz as the standard AC frequency in North America;Mixon P.;IEEE Power Engineering Review,1999
4. “IEEE recommended practices and requirements for harmonic control in electrical power systems ”IEEE Std 519‐1992 pp.1–112 1993.