1. R.W. Fischer, Voltage Unbalance on Three-Phase Distribution System, Tampa Electric Company Technical Report, April, 1977.
2. Operation of three-phase induction motors on unbalanced voltages;Williams;AIEE Trans. pt. III-A, Power Appar. Syst.,1954
3. Heating of induction motors on unbalanced voltages;Gafford;AIEE Trans. pt. III-A, Power Appar. Syst.,1959
4. Derating of polyphase induction motors operated with unbalanced line voltage;Berndt;AIEE Trans.,1964
5. Protection of induction motors against unbalanced voltage operation;Cummings;IEEE Trans. Ind. Appl.,1985