@article{approximatejointdiagonalizationand,
  title = {Approximate Joint Diagonalization and Geometric Mean of Symmetric Positive Definite Matrices},
  author = {Marco Congedo and Bijan Afsari and Alexandre Barachant and Maher Moakher},
  year = {2015},
  eprint = {1505.07343},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1505.07343v1},
}