@ARTICLE{2007-MIM-NGF,
  author = {E. Haber and J. Modersitzki},
  title = {Intensity gradient based registration and fusion of multi-modal images},
  journal = {Methods of Information in Medicine, Schattauer Verlag, Stuttgart},
  year = {2007},
  volume = {46},
  number={3},
  pages = {292--299},
}