1Department of Mathematics, University of California Santa Barbara, California 93106, USA
2Department of Mathematics, University of St. Thomas, Saint Paul, Minnesota 55105, USA
3Department of Physics, Washington University, Saint Louis, Missouri 63130, USA
4Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, CH 1015, Switzerland
(Received 12 July 2010; accepted 9 September 2010; published online 20 October 2010)
© 2010 American Institute of Physics
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