@article{JMLR:v16:aragam15a,
  author  = {Bryon Aragam and Qing Zhou},
  title   = {Concave Penalized Estimation of Sparse Gaussian Bayesian Networks},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {69},
  pages   = {2273--2328},
  url     = {http://jmlr.org/papers/v16/aragam15a.html}
}