Ayesha R. Ali, Thomas Richardson, Peter Spirtes, Jiji Zhang. Towards Characterizing Markov Equivalence Classes for Directed Acyclic Graphs with Latent Variables. In UAI 05, Proceedings of the 21st Conference in Uncertainty in Artificial Intelligence, July 26-29 2005, Edinburgh, Scotland. pages 10-17, AUAI Press, 2005. [doi]
Abstract is missing.