@article{metelli2021safe,
  author = {Metelli, Alberto Maria and Pirotta, Matteo and Calandriello, Daniele and Restelli, Marcello},
  title = {Safe Policy Iteration: A Monotonically Improving Approximate Policy Iteration Approach},
  journal = {Journal of Machine Learning Research (JMLR)},
  issn = {1532-4435},
  year = {2021},
  volume = {22},
  number = {97},
  pages = {1-83},
  url = {http://jmlr.org/papers/v22/19-707.html}
}