@article{JMLR:v15:cohen14a,
  author  = {Shay B. Cohen and Karl Stratos and Michael Collins and Dean P. Foster and Lyle Ungar},
  title   = {Spectral Learning of Latent-Variable PCFGs: Algorithms and Sample Complexity},
  journal = {Journal of Machine Learning Research},
  year    = {2014},
  volume  = {15},
  number  = {69},
  pages   = {2399--2449},
  url     = {http://jmlr.org/papers/v15/cohen14a.html}
}