@TechReport{laptev-etal:00,
  author =       "Ivan Laptev and Helmut Mayer and Tony Lindeberg and
                  Wolfgang Eckstein and Carsten Steger and Albert
                  Baumgartner",
  title =        "Automatic extraction of roads from aerial images
                  based on scale-space and snakes",
  institution =  "Department of Numerical Analysis and Computing
                  Science, KTH (Royal Institute of Technology)",
  year =         "2000",
  type =         "Technical Report",
  number =       "ISRN KTH NA/P--00/06--SE (CVAP 240)",
  address =      "Stockholm",
  month =        mar
}