Causal Inference in Sequential Decision-Making: The Confounding-Bridge Approach, Elias Bareinboim, Andrew Forney, Judea Pearl, 2015AAAI Conference on Artificial Intelligence, Vol. 29 (Association for the Advancement of Artificial Intelligence (AAAI))DOI: 10.1609/aaai.v29i1.9344 - This paper establishes a theoretical foundation for causal inference in dynamic systems and sequential decision-making, which is essential for understanding the causal perspective on RL and OPE.