@article{deepexpectationmaximizationinhidden,
  title = {Deep Expectation-Maximization in Hidden Markov Models via Simultaneous Perturbation Stochastic Approximation},
  author = {Chong Li and Dan Shen and C.J. Richard Shi and Hongxia Yang},
  year = {2019},
  url = {https://openreview.net/forum?id=BkxGAREYwB},
}