@incollection{GrueningHoppe2007,
  author    = {Gr{\"u}ning, H. and Hoppe, H.},
  title     = {Significance of uncertainties in the input data used in the integrated design of wastewater systems},
  series = {NOVATECH 2007, 6th International Conference on Innovative Technologies in Urban Drainage, Lyon-Villeurebanne, France, 25.-28.June 2007},
  booktitle = {NOVATECH 2007, 6th International Conference on Innovative Technologies in Urban Drainage, Lyon-Villeurebanne, France, 25.-28.June 2007},
  pages     = {1607 -- 1614},
  year      = {2007},
  language  = {en}
}
@incollection{GrueningHoppe2007,
  author    = {Gr{\"u}ning, H. and Hoppe, H.},
  title     = {Innovative alternatives for the treatment of storm water in separate system catchments},
  series = {NOVATECH 2007, 6th International Conference on Innovative Technologies in Urban Drainage, Lyon-Villeurebanne, France, 25.-28.June 2007},
  booktitle = {NOVATECH 2007, 6th International Conference on Innovative Technologies in Urban Drainage, Lyon-Villeurebanne, France, 25.-28.June 2007},
  pages     = {649 -- 656},
  year      = {2007},
  language  = {en}
}
@incollection{HoppeGruening2007,
  author    = {Hoppe, H. and Gr{\"u}ning, H.},
  title     = {Vergleichende Untersuchungen zu Regenkl{\"a}rbecken und Filtersystemen.},
  series = {Tagungsunterlagen der DWA - Deutsche Vereinigung f{\"u}r Wasserwirtschaft, Wasser und Abfall e.V., 6. Regenwassertage am 11./12. Juni 2007 in Passau},
  booktitle = {Tagungsunterlagen der DWA - Deutsche Vereinigung f{\"u}r Wasserwirtschaft, Wasser und Abfall e.V., 6. Regenwassertage am 11./12. Juni 2007 in Passau},
  year      = {2007},
  language  = {de}
}
@incollection{HoppeGruening2007,
  author    = {Hoppe, H. and Gr{\"u}ning, H.},
  title     = {Selbst{\"u}berwachung von Kanalnetz und Kl{\"a}ranlage in Deutschland - Erfahrungen aus NRW. 19. Fachtagung f{\"u}r Abwasserwirtschaft und Gew{\"a}sserentwicklung, 24./25. April},
  volume    = {60},
  isbn      = {978-3-930400},
  pages     = {S. 171 -- 180},
  year      = {2007},
  language  = {de}
}