1. S.W. Feaster, N.D. Schwartz, T. Kuntz, NYT-It’s All Connected-A Spectators Guide to the Euro Crisis, New York Times. http://Nytimes.Com Retrieved 2012-05-14.
2. G.V. Xaquin, A. Mclean, TSE Archie (2011-10-22). NYT-It’s All Connected-An Overview of the Euro Crisis-October 2011, New York Times (Europe; Germany; Greece; France; Ireland; Spain; Portugal; Italy; Great Britain; United States; Japan: http://Nytimes.Com). Retrieved 2012-05-14.
3. Sovereign credit risk in the Eurozone;Haidar;World Econ.,2012
4. G. Matlock, (16 February 2010), Peripheral Eurozone Government Bond Spreads Widen, Reuters. Retrieved 28 April 2010.
5. Complex networks in brain electrical activity