@article{JMLR:v9:krupka08a,
  author  = {Eyal Krupka and Naftali Tishby},
  title   = {Generalization from Observed to Unobserved Features by Clustering},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {11},
  pages   = {339--370},
  url     = {http://jmlr.org/papers/v9/krupka08a.html}
}