@inproceedings{herrera_salmeron_vazquez_litran_2007, 
  title={Instantaneous Reactive Power Theory to N Wire Systems}, 
  DOI={10.1109/isie.2007.4374993}, 
  publisher={IEEE}, 
  author={Herrera and Salmeron and Vazquez and Litran}, 
  year={2007}
  }