@article{GartzenGebhardtAngeretal.1994,
  author    = {Gartzen, Johannes and Gebhardt, Andreas and Anger, A. and Petschke, U. and Lingens, Hans},
  title     = {Laserstrahlschweißen mit Schweißdraht von W{\"a}rmetauschern mit hohem Wirkungsgrad},
  series = {Proceedings : Aachen, Germany, 31st October - 4th November, 1994 / 27th ISATA},
  journal   = {Proceedings : Aachen, Germany, 31st October - 4th November, 1994 / 27th ISATA},
  publisher = {Automotive Automation},
  address   = {Croydon},
  isbn      = {0-947719-64-4},
  pages     = {397 -- 403},
  year      = {1994},
  language  = {de}
}
@article{GartzenLingensSchoenbohmetal.1993,
  author    = {Gartzen, Johannes and Lingens, Hans and Sch{\"o}nbohm, J. and Baumjohann, F. and Gebhardt, Andreas},
  title     = {Laserh{\"a}rten - im Verbund m{\"o}glich. Forschungsverbund Lasertechnik NRW auf der Suche nach neuen Laseranwendungen},
  series = {Technica, Rupperswil. 42 (1993), H. 24},
  journal   = {Technica, Rupperswil. 42 (1993), H. 24},
  isbn      = {0040-866X},
  pages     = {14 -- 18},
  year      = {1993},
  language  = {de}
}