@article{JMLR:v8:bartlett07a,
  author  = {Peter L. Bartlett and Ambuj Tewari},
  title   = {Sparseness vs Estimating Conditional Probabilities: Some Asymptotic Results},
  journal = {Journal of Machine Learning Research},
  year    = {2007},
  volume  = {8},
  number  = {28},
  pages   = {775--790},
  url     = {http://jmlr.org/papers/v8/bartlett07a.html}
}