@INPROCEEDINGS{2003-NACOM-FM,
  author = {B. Fischer and J. Modersitzki},
  title = {Fast image registration -- a variational approach},
  booktitle = {Proceedings of the International Conference on Numerical Analysis
    \& Computational Mathematics (NACoM-2003)},
  year = {2003},
  editor = {G Psihoyios},
  pages = {69--74},
}