@article{
  author = {Abiri, E.},
  title = {Direct Power Control of an Active Filter by Constant Switching Frequency},
  journal = {Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran},
  year = {2009},
  volume = {7},
  number = {2},
  pages = {184-189},
  doi = {}
}