“…In particular, Onnela et al (2003a,b,c), used MSTs extensively to study the dynamics of cross correlations during market crashes, while many others used clustering techniques based on the MST to discover different sectors in a stock market (Onnela et al, 2004;Bonanno et al, 2004;Boginski et al, 2005;Tumminello et al, 2007;Coelho et al, 2007b;Jung et al, 2008). At a higher level, the MST have been used to visualize how the interdependences of the European economies are evolving (Gligor and Ausloos, 2007;Gilmore et al, 2008), and how global markets are linked to each other (Miśkiewicz and Ausloos, 2006;Coelho et al, 2007a;Eryigit and Eryigit, 2009).…”