@inproceedings{steger-etal:97,
  author =       "Carsten Steger and Helmut Mayer and Bernd Radig",
  title =        "The Role of Grouping for Road Extraction",
  pages =        "245--256",
  editor =       "A. Gruen and E. Baltsavias and O. Henricsson",
  booktitle =    "Automatic Extraction of Man-Made Objects from Aerial
                  and Space Images (II)",
  year =         "1997",
  publisher =    "Birkh{\"a}user Verlag",
  address =      "Basel"
}