Bernaola-Galván, PedroEugene Stanley, H.Ivanov, Plamen Ch.Nunes Amaral, Luís A.2004-12-032004-12-0320012001http://hdl.handle.net/2003/135710.17877/DE290R-11150enThe American Physical SocietyPhysical Review Letters530Scale Invariance in the Nonstationarity of Human Heart Rate10.1103/PhysRevLett.87.168105article (journal)