@article{JMLR:v8:clark07a,
  author  = {Alexander Clark and R{{\'e}}mi Eyraud},
  title   = {Polynomial Identification in the Limit of Substitutable Context-free Languages},
  journal = {Journal of Machine Learning Research},
  year    = {2007},
  volume  = {8},
  number  = {60},
  pages   = {1725--1745},
  url     = {http://jmlr.org/papers/v8/clark07a.html}
}