@book{GerhardtKramer1983,
  author    = {Gerhardt, Hans Joachim and Kramer, Carl},
  title     = {Windlasten auf nach innen geneigten Dachfl{\"a}chen},
  publisher = {IRB-Verl.},
  address   = {Stuttgart},
  pages     = {17, [11] Bl. : graph. Darst.},
  year      = {1983},
  language  = {de}
}
@book{Gerhardt1983,
  author    = {Gerhardt, Hans Joachim},
  title     = {Abschlußbericht zum Forschungsvorhaben 'Untersuchungen zur Windbelastung von kleinformatigen harten Dachwerkstoffen' / Forscher: C. Kramer ; H. J. Gerhardt. Bearb.: H.-W. Kuster},
  publisher = {IRB-Verl.},
  address   = {Stuttgart},
  pages     = {55, [70] S. : Ill., graph. Darst.},
  year      = {1983},
  language  = {de}
}