@article{Kaniewski:2008,
  author  = "J. Kaniewski and Z. Fedyczak",
  title   = "Modelling and analysis of a three-phase quadrature phase shifter with a hybrid transformer",
  journal = "Przegląd Elektrotechniczny",
  number  = "nr 11",
  pages   = "269--274",
  year    = "2008",
}