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 Y. Bar-Yam, Complexity Rising: From Human Beings to Human Civilization, a Complexity Profile, in Encyclopedia of Life Support Systems (EOLSS), developed under the Auspices of the UNESCO, EOLSS Publishers, Oxford, UK, http://www.eolss.net (2002).
 D. MacKenzie, “The Collapse of Civilization,” New Scientist, April 5, 2008: 28-35.
 D. MacKenzie, “Why the Financial System is Like an Ecosystem,” New Scientist, October 22, 2008: No. 2679.
 V. Misra, D. Harmon, and Y. Bar-Yam, Vulnerability Analysis of High Dimensional Complex Systems, Lecture Notes in Computer Science 6366, 560-572 (Springer, Heidelberg 2010).
 D. Harmon, B. Stacey, Y. Bar-Yam, and Y. Bar-Yam, Networks of Economic Market Interdependence and Systemic Risk. arXiv:1011.3707v2, November 16, 2010. http://arxiv4.library.cornell.edu/pdf/1011.3707v2