@article{HeuermannIbrahimHillebrand2007,
  author    = {Heuermann, Holger and Ibrahim, Irfan and Hillebrand, J.},
  title     = {Vector-Signal-Generator with Two ?'?'-PLL's / Ibrahim, I. ; Hillebrand, J. ; Heuermann, H.},
  series = {European Conference on Wireless Technologies, 2007. ECWT 2007 ; 8 - 10 October 2007 Munich, Germany},
  journal   = {European Conference on Wireless Technologies, 2007. ECWT 2007 ; 8 - 10 October 2007 Munich, Germany},
  isbn      = {978-2-87487-003-3},
  pages     = {1 -- 4},
  year      = {2007},
  language  = {en}
}
@article{HeuermannIbrahim2008,
  author    = {Heuermann, Holger and Ibrahim, Irfan},
  title     = {Novel theory and architecture of a vector signal generator implemented with two PLLs / Ibrahim, Irfan ; Heuermann, Holger},
  series = {European Conference on Wireless Technology, 2008. EuWiT 2008.},
  journal   = {European Conference on Wireless Technology, 2008. EuWiT 2008.},
  isbn      = {978-2-87487-008-8},
  pages     = {85 -- 88},
  year      = {2008},
  language  = {en}
}
@article{HeuermannIbrahim2009,
  author    = {Heuermann, Holger and Ibrahim, Irfan},
  title     = {Improvements in the flicker noise reduction technique for osillator designs / Ibrahim, Irfan ; Heuermann, Holger},
  series = {European Microwave Conference, 2009 : EuMC 2009 ; Sept. 29, 2009 - Oct. 1, 2009, Rome, Italy ; part of European Microwave Week (EuMW) / sponsored by EuMA, European Microwave Association ... Endorsed by IEEE},
  journal   = {European Microwave Conference, 2009 : EuMC 2009 ; Sept. 29, 2009 - Oct. 1, 2009, Rome, Italy ; part of European Microwave Week (EuMW) / sponsored by EuMA, European Microwave Association ... Endorsed by IEEE},
  publisher = {IEEE},
  address   = {Piscataway, NJ},
  isbn      = {978-1-4244-4748-0},
  pages     = {1215 -- 1218},
  year      = {2009},
  language  = {en}
}
@book{HeuermannSimonIbrahim2010,
  author    = {Heuermann, Holger and Simon, Sven and Ibrahim, Irfan},
  title     = {Konzeption und Realisierung eines spektralreinen vektoriellen Transmitters mit CMOS-Sigma-Delta-Synthesizern im 1-5 GHz-Bereich / Antragsteller: Fachhochschule Aachen ... Teilprojektleitung: Heuermann},
  publisher = {Fachhochschule},
  address   = {Aachen},
  pages     = {156 S. : Ill., graph. Darst.},
  year      = {2010},
  language  = {de}
}