Bouchaud, Jean-PhilippeMatacz, AndrewPotters, Marc2004-12-032004-12-0320012001http://hdl.handle.net/2003/175510.17877/DE290R-4524enThe American Physical SocietyPhysical Review Letters530Leverage Effect in Financial Markets10.1103/PhysRevLett.87.228701article (journal)