@inproceedings{HennickeThomasIrreketal.2004,
  author    = {Hennicke, Peter and Thomas, Stefan and Irrek, Wolfgang and Zymla, Bernhard},
  title     = {Towards sustainable energy systems : integrating renewable energy and energy efficiency is the key ; discussion paper for the international conference {"}Renewables 2004{"}},
  publisher = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie for Climate, Environment, Energy},
  address   = {Wuppertal},
  year      = {2004},
  language  = {en}
}