@incollection{Helmig2009,
  author    = {Helmig, Ilka},
  title     = {Tristan und Isolde, Samson und Dalila, Capriccio : 3D illustration for posters of Cologne Opera},
  series = {Papercraft [1] : design and art with paper},
  booktitle = {Papercraft [1] : design and art with paper},
  editor    = {Klanten, Robert},
  publisher = {Gestalten Verlag},
  address   = {Berlin},
  isbn      = {978-3-89955-251-5},
  pages     = {202},
  year      = {2009},
  subject      = {Papierkunst},
  language  = {en}
}
@article{KoellenspergerBragardPlumetal.2009,
  author    = {K{\"o}llensperger, P. and Bragard, Michael and Plum, T. and De Doncker, R. W.},
  title     = {The dual GCT : new high-power device using optimized GCT technology},
  series = {IEEE transactions on industry applications},
  volume    = {45},
  journal   = {IEEE transactions on industry applications},
  number    = {5},
  issn      = {0093-9994},
  doi       = {10.1109/TIA.2009.2027364},
  pages     = {1754 -- 1762},
  year      = {2009},
  language  = {en}
}