{{cite journal | author =Per Bak, and Maya Paczuski | year = 1995 | title = Complexity, contingency, and criticality | journal =Proc Natl Acad Sci U S A | volume = 92 | pages = 6689–6696 | pmid = 11607561 | doi = 10.1073/pnas.92.15.6689 | issue = 15 | pmc = 41396|bibcode = 1995PNAS...92.6689B }}</ref>它的概念已经被应用于各个领域,比如地球物理学,<ref name=SmalleyTurcotteSolla85>{{cite journal|author1=Smalley, R. F., Jr. |author2=Turcotte, D. L. |author3=Solla, S. A. | year = 1985| title = A renormalization group approach to the stick-slip behavior of faults
{{cite journal | author =Per Bak, and Maya Paczuski | year = 1995 | title = Complexity, contingency, and criticality | journal =Proc Natl Acad Sci U S A | volume = 92 | pages = 6689–6696 | pmid = 11607561 | doi = 10.1073/pnas.92.15.6689 | issue = 15 | pmc = 41396|bibcode = 1995PNAS...92.6689B }}</ref>它的概念已经被应用于各个领域,比如地球物理学,<ref name=SmalleyTurcotteSolla85>{{cite journal|author1=Smalley, R. F., Jr. |author2=Turcotte, D. L. |author3=Solla, S. A. | year = 1985| title = A renormalization group approach to the stick-slip behavior of faults