@article{JMLR:v16:lee15a,
  author  = {Wonyul Lee and Yufeng Liu},
  title   = {Joint Estimation of Multiple Precision Matrices with Common Structures},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {31},
  pages   = {1035--1062},
  url     = {http://jmlr.org/papers/v16/lee15a.html}
}