@misc{LeonhartsbergerNenning,
  author    = {Leonhartsberger, Kurt and Nenning, Thomas},
  title     = {Kleinwindkraft in {\"O}sterreich},
  subject      = {Wind Power},
  language  = {de}
}
@misc{LeonhartsbergerNenning,
  author    = {Leonhartsberger, Kurt and Nenning, Thomas},
  title     = {Speichersysteme - Welcher Speicher f{\"u}r welches Einsatzgebiet},
  subject      = {Energy Storage},
  language  = {de}
}