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May 8, 2012, Ross A. Hammond
September 14, 2010, Ross A. Hammond
September 14, 2010, Ross A. Hammond and Ruth Levine
December 2008, Derek Cummings, Joshua M. Epstein, Ross A. Hammond and Jon Parker
November 8, 2007, Ross A. Hammond
August 2007 , Joshua M. Epstein and Ross A. Hammond
March 13, 2007, Ross A. Hammond
February 2006, Robert Axtell, Steven Durlauf, Joshua M. Epstein, Ross A. Hammond, Ben Klemens, Jon Parker, et al.
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