sources

 

1. G. K. Zipf, Human Behavior and the Principle of Least Effort: An Introduction to Human Ecology, Addison-Wesley, Boston, Mass, USA, 1949

   
   

   P. Bak, How Nature Works: The Science of Self-Organized Criticality, Copernicus Publications, Göttingen, Germany, 1996. View at: Publisher Site | MathSciNet

   
   

   G. Pruessner, Self-Organized Criticality, Cambridge University Press, Cambridge, UK, 2012. View at: Publisher Site

   
   

   Vasilii A. Gromov, Anastasia M. Migrina, "A Language as a Self-Organized Critical System", Complexity, vol. 2017, Article ID 9212538, 7 pages, 2017. https://doi.org/10.1155/2017/9212538