@article{Heuermann2007,
  author    = {Holger Heuermann},
  title     = {A Synthesis Technique for Mono- and Mixed-Mode Symmetrical Filter},
  journal   = {Conference proceedings : Tuesday 12th, Wednesday 13th and Thursday 14th October, [RAI International Exhibition and Congress Centre, Amsterdam ; part of European Microwave Week 2004] / EuMA, European Microwave Association . Vol. 1},
  pages     = {309 -- 312},
  year      = {2007},
}