@article{JMLR:v23:21-1387,
  author  = {Yanwei Jia and Xun Yu Zhou},
  title   = {Policy Gradient and Actor-Critic Learning in Continuous Time and Space: Theory and Algorithms},
  journal = {Journal of Machine Learning Research},
  year    = {2022},
  volume  = {23},
  number  = {275},
  pages   = {1--50},
  url     = {http://jmlr.org/papers/v23/21-1387.html}
}