@book{Gerhardt1999,
  author    = {Gerhardt, Hans Joachim},
  title     = {Windeinwirkung auf Bedachungssysteme},
  publisher = {Shaker},
  address   = {Aachen},
  isbn      = {3-8265-4799-3},
  pages     = {IV, 126 S. : Ill., graph. Darst.},
  year      = {1999},
  language  = {de}
}
@article{GerhardtWacker1999,
  author    = {Gerhardt, Hans Joachim and Wacker, J.},
  title     = {Immissionsprognosen auf der Basis von Windkanaluntersuchungen},
  series = {Immissionsschutz. 4 (1999), H. 3},
  journal   = {Immissionsschutz. 4 (1999), H. 3},
  isbn      = {1430-9262},
  pages     = {84 -- 89},
  year      = {1999},
  language  = {de}
}
@article{Gerhardt1999,
  author    = {Gerhardt, Hans Joachim},
  title     = {RWA-Einbau in Geb{\"a}udew{\"a}nden},
  series = {Brandschutz in {\"o}ffentlichen und privaten Geb{\"a}uden (1999)},
  journal   = {Brandschutz in {\"o}ffentlichen und privaten Geb{\"a}uden (1999)},
  pages     = {46 -- 48},
  year      = {1999},
  language  = {de}
}