@Article{mayer-steger:98,
  author =       "Helmut Mayer and Carsten Steger",
  title =        "Scale-Space Events and Their Link to Abstraction for
                  Road Extraction",
  journal =      "ISPRS Journal of Photogrammetry and Remote Sensing",
  year =         "1998",
  volume =       "53",
  number =       "2",
  pages =        "62--75",
  month =        apr
}