Characterization of key-points in images
@InProceedings{sommer93b,
  author = 	 "M. Michaelis and G. Sommer",
  title = 	 "Characterization of key-points in images",
    address =	 "Innsbruck",
  editor =       "J.-L. Flanagan",
  booktitle =    {Proc. Conf. Substance Identification Technologies,
    SPIE Proceedings Series Vol. 2093},
  pages =        "450-461",
  year =         1993
}