@article{JMLR:v7:mukherjee06b,
  author  = {Sayan Mukherjee and Qiang Wu},
  title   = {Estimation of Gradients and Coordinate Covariation in Classification},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {88},
  pages   = {2481--2514},
  url     = {http://jmlr.org/papers/v7/mukherjee06b.html}
}