@inproceedings{HoettgesRolfingSiekeretal.2011,
  author    = {H{\"o}ttges, J{\"o}rg and Rolfing, Richard and Sieker, Heiko and Siekmann, Marko and Wermter, Paul},
  title     = {GIS-gest{\"u}tzte Erstellung von Niederschlagswasserbeseitigungskonzepten},
  series = {12. K{\"o}lner Kanal- und Kl{\"a}ranlagen-Kolloquium : 13. und 14. Oktober 2011 im Maternushaus, K{\"o}ln / ISA, Institut und Lehrstuhl f{\"u}r Siedlungswasserwirtschaft},
  booktitle = {12. K{\"o}lner Kanal- und Kl{\"a}ranlagen-Kolloquium : 13. und 14. Oktober 2011 im Maternushaus, K{\"o}ln / ISA, Institut und Lehrstuhl f{\"u}r Siedlungswasserwirtschaft},
  editor    = {Pinnekamp, Johannes},
  publisher = {Ges. zur F{\"o}rderung der Siedlungswasserwirtschaft an der RWTH Aachen},
  address   = {Aachen},
  isbn      = {978-3-938996-08-9},
  pages     = {8/1 -- 8/13},
  year      = {2011},
  language  = {de}
}
@inproceedings{StepkesZimmermannMuelleretal.2007,
  author    = {Stepkes, Hermann and Zimmermann, J. and M{\"u}ller, Karsten and Siekmann, Marko and Pinnekamp, Josef},
  title     = {Economical rehabilitation of sewer systems by ground penetration radar investigations},
  series = {Strategic asset management of water supply and wastewater infrastructures : invited papers from the 2nd IWA Leading Edge Conference on Strategic Asset Management (LESAM), Lisbon, October [17 - 19] 2007 / ed. by Helene Alegre and Maria do C{\´e}u Almeida},
  booktitle = {Strategic asset management of water supply and wastewater infrastructures : invited papers from the 2nd IWA Leading Edge Conference on Strategic Asset Management (LESAM), Lisbon, October [17 - 19] 2007 / ed. by Helene Alegre and Maria do C{\´e}u Almeida},
  publisher = {IWA Publ.},
  address   = {London},
  isbn      = {9781843391869},
  pages     = {501 -- 520},
  year      = {2007},
  language  = {en}
}