@inproceedings{shellpcastatisticalshapemodellingin,
  title = {Shell PCA: Statistical Shape Modelling in Shell Space},
  author = {Chao Zhang and Behrend Heeren and Martin Rumpf and William A. P. Smith},
  year = {2015},
  booktitle = {ICCV 2015 12},
  url = {http://openaccess.thecvf.com/content_iccv_2015/html/Zhang_Shell_PCA_Statistical_ICCV_2015_paper.html},
}