Brendan J. Frey. Extending Factor Graphs so as to Unify Directed and Undirected Graphical Models. In Christopher Meek, Uffe Kjærulff, editors, UAI 03, Proceedings of the 19th Conference in Uncertainty in Artificial Intelligence, August 7-10 2003, Acapulco, Mexico. pages 257-264, Morgan Kaufmann, 2003.
Abstract is missing.