@misc{RuppRohr1991,
  author    = {Axel Rupp and Klaus Rohr},
  title     = {Energy efficiency of laser produced C- and Ta-ion sources},
  institution = {Fachbereich Physik},
  type      = {workingpaper},
  year        = {1991},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-15119},
}