Markov Equivalence Classes for Maximal Ancestral Graphs. - Ayesha R. Ali; Thomas S. Richardson 001 (UAI, 2002)

Towards Characterizing Markov Equivalence Classes for Directed Acyclic Graphs with Latent Variables. - Ayesha R. Ali; Thomas S. Richardson 001; Peter Spirtes; Jiji Zhang (UAI, 2005)