@ARTICLE{DrRi05,
  author = {Droske, M. and Ring, W.},
  title = {A {M}umford-{S}hah Level-Set Approach for Geometric Image Registration},
  journal = {SIAM Journal on Applied Mathematics},
  year = {2006},
  volume = {66},
  pages = {2127--2148},
  number = {6},
  pdf = {http://numod.ins.uni-bonn.de/research/papers/public/DrRi05.pdf}
}