@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}
}
@article{StepkesZimmermannMuelleretal.2007,
  author    = {Stepkes, Hermann and Zimmermann, Jochen and M{\"u}ller, Karsten and Siekmann, Marko and Niessen, J{\"u}rgen and Hofmann, Daniela and Pinnekamp, Johannes},
  title     = {Georadarmess-System zur Kanalsanierung},
  series = {wwt Wasserwirtschaft und Wassertechnik. 2007, H. 3},
  journal   = {wwt Wasserwirtschaft und Wassertechnik. 2007, H. 3},
  issn      = {1438-5716},
  pages     = {16 -- 19},
  year      = {2007},
  language  = {de}
}