@techreport{HuebnerAckermannHeyingetal.1999,
  author    = {H{\"u}bner, Andreas and Ackermann, J{\"o}rg and Heying, Klaus and Krosigk, Dedo von and Richter, Nikolaus and Benstem, Anke and Lechtenb{\"o}hmer, Andrea and Lechtenb{\"o}hmer, Stefan and Nanning, Sabine},
  title     = {Energieeinsparung in Schulen in NRW : Band 3 ; Handbuch Material},
  edition   = {Stand: Mai 1999},
  institution = {Ministerium f{\"u}r Wirtschaft und Mittelstand, Technologie und Verkehr des Landes Nordrhein-Westfalen},
  address   = {D{\"u}sseldorf},
  pages     = {146},
  year      = {1999},
  language  = {de}
}