@inproceedings{LuepfertHerrmannPriceetal.2004,
  author    = {L{\"u}pfert, E. and Herrmann, Ulf and Price, Henry and Zarza, E. and Kistener, R.},
  title     = {Towards Standard Performance Analysis for Parabolic Trough Collector Fields},
  series = {12th International Symposium Solar Power and Chemical Energy Systems, October 6-8, 2004, Oaxaca Mexico ; SolarPACES International Symposium, 12},
  booktitle = {12th International Symposium Solar Power and Chemical Energy Systems, October 6-8, 2004, Oaxaca Mexico ; SolarPACES International Symposium, 12},
  editor    = {Ramos, C.},
  publisher = {Instituto de Investigaciones Electricas},
  address   = {[s.l.]},
  isbn      = {968-6114-18-1},
  year      = {2004},
  language  = {en}
}
@incollection{BouvyKuperjans2004,
  author    = {Bouvy, C. and Kuperjans, Isabel},
  title     = {Mikro-Gasturbinen : eine neue Technologie zur Kraft-W{\"a}rme-Kopplung in kleinen und mittleren Unternehmen},
  series = {Entwicklungslinien der Energietechnik 2004},
  booktitle = {Entwicklungslinien der Energietechnik 2004},
  edition   = {CD-ROM-Ausg.},
  publisher = {VDI-Verlag},
  address   = {D{\"u}sseldorf},
  year      = {2004},
  language  = {de}
}