@article{convexbandingofthecovariancematrix,
  title = {Convex Banding of the Covariance Matrix},
  author = {Jacob Bien and Florentina Bunea and Luo Xiao},
  year = {2014},
  eprint = {1405.6210},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1405.6210v1},
}