@article{Wala,
  author    = {Wala, Thomas},
  title     = {Die betriebswirtschaftliche Klausur: Investitionsrechnung},
  series = {WISU},
  journal   = {WISU},
  number    = {10},
  pages     = {1122 ff},
  subject      = {Investitionsrechnung},
  language  = {de}
}