@article{metelli2020importance,
  author = {Metelli, Alberto Maria and Papini, Matteo and Montali, Nico and Restelli, Marcello},
  title = {Importance Sampling Techniques for Policy Optimization},
  journal = {Journal of Machine Learning Research (JMLR)},
  issn = {1532-4435},
  year = {2020},
  volume = {21},
  number = {141},
  pages = {1-75},
  url = {http://jmlr.org/papers/v21/20-124.html}
}