@article{JMLR:v20:18-484,
  author  = {Alexander M. Franks and Peter Hoff},
  title   = {Shared Subspace Models for Multi-Group Covariance Estimation},
  journal = {Journal of Machine Learning Research},
  year    = {2019},
  volume  = {20},
  number  = {171},
  pages   = {1--37},
  url     = {http://jmlr.org/papers/v20/18-484.html}
}