His publications are here: <a href="http://www.mit.edu/~parrilo/pubs/index.html" rel="nofollow">http://www.mit.edu/~parrilo/pubs/index.html</a>. This one in particular: <a href="http://arxiv.org/pdf/0909.0808v1" rel="nofollow">http://arxiv.org/pdf/0909.0808v1</a> looks like it might be related.