David Barber, Wim Wiegerinck. Tractable Variational Structures for Approximating Graphical Models. In Michael J. Kearns, Sara A. Solla, David A. Cohn, editors, Advances in Neural Information Processing Systems 11, [NIPS Conference, Denver, Colorado, USA, November 30 - December 5, 1998]. pages 183-189, The MIT Press, 1998. [doi]
Abstract is missing.