@inproceedings{christensen98:-visual-based-navig,
  address       = {Tunesia},
  author        = {H.I. Christensen and J.-O. Eklundh},
  booktitle     = {CESA-98},
  category      = {Conference},
  month         = apr,
  organization  = {IEEE},
  pages         = {47--53},
  pdf           = {hic-papers/CESA-98.pdf},
  publisher     = {CS Press},
  title         = {Visual-Based Navigation -- A Survey},
  volume        = 4,
  year          = 1998
}