@ARTICLE{images:cad07,
   AUTHOR={Niklas Peinecke and Franz-Erich Wolter and Martin Reuter},
   TITLE={Laplace Spectra as Fingerprints for Image Recognition},
   JOURNAL={Computer-Aided Design},
   VOLUME={39},
   NUMBER={6},
   PAGES={460--476},
   YEAR={2007}
}