@inproceedings{Mertens2018,
  author    = {K. Mertens},
  title     = {"Do Photovoltaics make sense in countries like Germany?", Invited Paper zur 7th International Energy and Sustainability Confrerence, Cologne Institute for Renewable Energy CIRE der TH K{\"o}ln, 17.05.2018, K{\"o}ln},
  year      = {2018},
}