Aoyagi, NaokoHidaka, IchiroIvanov, Plamen Ch.Nunes Amaral, Luís A.Tomono, Shinji2004-12-142004-12-1420012001http://hdl.handle.net/2003/1871910.17877/DE290R-585enThe American Physical SocietyPhysical Review Letters530Behavioral-Independent Features of Complex Heartbeat Dynamics10.1103/PhysRevLett.86.6026article (journal)