@INPROCEEDINGS{2004-BVM-Potts,
  author = {S. Heldmann and O. Mahnke and D. Potts and J. Modersitzki and B.
    Fischer},
  title = {Fast computation of Mutual Information in a variational image registration
    approach},
  booktitle = {Bildverarbeitung f\"ur die Medizin 2004},
  year = {2004},
  editor = {T Tolxdorff and J Braun and H Handels and A Horsch and HP Meinzer},
  pages = {448--452},
  publisher = {Springer},
}