@article{hauberg:tpami:grassmann,
  title = {Scalable Robust Principal Component Analysis using Grassmann Averages},
  author = {S{\o}ren Hauberg and Aasa Feragen and Raffi Enficiaud and Michael J. Black},
  journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)},
  year = {2015},
}