Aguilar, A.Covington, A. M.Covington, I. R.Gharaibeh, M.Shirley, C. A.2004-12-032004-12-0320012001http://hdl.handle.net/2003/183210.17877/DE290R-11577enThe American Physical SocietyPhysical Review Letters53010.1103/PhysRevLett.87.243002article (journal)