@article{JMLR:v9:lin08b,
  author  = {Chih-Jen Lin and Ruby C. Weng and S. Sathiya Keerthi},
  title   = {Trust Region Newton Method for Logistic Regression},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {22},
  pages   = {627--650},
  url     = {http://jmlr.org/papers/v9/lin08b.html}
}