@article{JMLR:v19:17-285,
  author  = {Binyan Jiang and Xiangyu Wang and Chenlei Leng},
  title   = {A Direct Approach for Sparse Quadratic Discriminant Analysis},
  journal = {Journal of Machine Learning Research},
  year    = {2018},
  volume  = {19},
  number  = {31},
  pages   = {1--37},
  url     = {http://jmlr.org/papers/v19/17-285.html}
}