@article{lehericy2018sbs,
  author  = {Luc Leh{\'e}ricy},
  title   = {State-by-state Minimax Adaptive Estimation for Nonparametric Hidden {M}arkov Models},
  journal = {Journal of Machine Learning Research},
  year    = {2018},
  volume  = {19},
  number  = {39},
  pages   = {1-46},
  url     = {http://jmlr.org/papers/v19/17-345.html}
}