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Complex critical infrastructures such as power transmission networks, communication systems, transportation network and others display many of the characteristic properties of complex systems. They exhibit infrequent large cascading failures that often obey a characteristic power law distribution in their probability versus size. This power law behavior suggests that conventional risk analysis does not apply to these systems. They also often display correlations between events suggesting thatdoi:10.1109/hicss.2012.508 dblp:conf/hicss/NewmanCDD12 fatcat:epgpn7zq2behlhpxgcnkxgzbdq