@inproceedings{StepkesZimmermannMuelleretal.2013,
  author    = {Hermann Stepkes and J. Zimmermann and Karsten M{\"u}ller and Marko Siekmann and Josef Pinnekamp},
  title     = {Economical rehabilitation of sewer systems by ground penetration radar investigations},
  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},
  pages     = {501 -- 520},
  year      = {2013},
}