1. EN 50160, Voltage Characteristics of Electricity Supplied by Public Distribution Systems, CENELEC, November 1994.
2. Joint Working Group Cigré C4.07/Cired, Power Quality Indices and Objectives, Final WG Report March 2004.
3. UIE, Guide to Quality of Electrical Supply for Industrial Installations, Part IV: Transient and Temporary Overvoltages and Currents, 2001.
4. Indices for assessing utility distribution system RMS variation performance;Brooks;IEEE Trans. Power Deliver.,1998
5. IEC EN 61000-4-11: Testing and Measurement Techniques: Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests.