Perspect Biol Med. 1997 Summer;40(4):543-61. Fractal variability versus pathologic periodicity: complexity loss and stereotypy in disease. Goldberger AL. Department of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. Publication Types: Review Review, Tutorial PMID: 9269744 [PubMed - indexed for MEDLINE]