@article{MertensStegemannStoeppel2012,
  author    = {K. Mertens and Th. Stegemann and T. St{\"o}ppel},
  title     = {Mit g{\"u}nstiger Alternative EL-Bilder erstellen},
  journal   = {Elektropraktiker Photovoltaik},
  number    = {7/8},
  pages     = {44 -- 45},
  year      = {2012},
}