@article{JMLR:v9:dietterich08a,
  author  = {Thomas G. Dietterich and Guohua Hao and Adam Ashenfelter},
  title   = {Gradient Tree Boosting for Training Conditional Random Fields},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {69},
  pages   = {2113--2139},
  url     = {http://jmlr.org/papers/v9/dietterich08a.html}
}