@article{JMLR:v26:24-2230,
  author  = {Kweku Abraham and Elisabeth Gassiat and Zacharie Naulet},
  title   = {Frontiers to the learning of nonparametric hidden Markov models},
  journal = {Journal of Machine Learning Research},
  year    = {2025},
  volume  = {26},
  number  = {155},
  pages   = {1--75},
  url     = {http://jmlr.org/papers/v26/24-2230.html}
}