@inproceedings{KaulSchmitzOetzeletal.2002,
  author    = {P. Kaul and U. Schmitz and M. Oetzel and C. Brach-Annies and A. Kerschberger},
  title     = {Energy Efficiency and Solar Energy Use in Commercial Buildings, University of Applied Sciences Bonn-Rhein-Sieg},
  series = {Sayigh (Eds.): Renewables: world's best energy option extended abstracts. World Renewable Energy Congress VII, 29 June - 5 July 2002, Cologne, Germany},
  isbn      = {0-08-044079-7},
  year      = {2002},
  language  = {en}
}