1. Carpenter C. Copper advances as Chile Earthquake cuts power, halts mines. BusinessWeek; February 28, 2010.
2. Building the resilient supply chain;Christopher;International Journal of Logistics Management,2004
3. Protection critical assets;Church;Geographical Analysis,2007
4. Identifying critical infrastructure;Church;Annals of the Association of American Geographers,2004
5. CNN.com. Gulf oil production still on hold 〈http://edition.cnn.com/2005/BUSINESS/09/28/oil.production/〉; 2008.