Consistent multi-modal non-rigid registration based on a variational approach. Zhang, Z., Jiang, Y., & Tsui, H. Pattern Recognition Letter, 27:715-725, 2006.
bibtex   
@Article{Zhang_2006_12289,
  author = {Zhang, Z. and Jiang, Y. and Tsui, HT},
 journal = {Pattern Recognition Letter},
 pages = {715-725},
 title = {{Consistent multi-modal non-rigid registration based on a variational approach.}},
 volume = {27},
 year = {2006},
 title_with_no_special_chars = {Consistent multimodal nonrigid registration based on a variational approach}
}

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