1. Power factor correction in nonsinusoidal systems by the use of capacitance;Shepherd;J. Phys. D,1973
2. Suggested definition of reactive power for nonsinusoidal systems;Shepherd;Proc. IEE,1973
3. Energy Flow and Power Factor in Nonsinusoidal Circuits;Shepherd,1979
4. Reactive-power definitions and power factor improvement in nonlinear systems;Sharon;Proc. IEE,1973
5. Minimization of distortion power of nonsinusoidal sources applied to linear loads;Czarnecki;IEE Proc. -C,1981