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• http://ccss2eso.blogspot.com/p/esquemas.html
• http://2.bp.blogspot.com/_bpt5AxEHutc/S46oxzV-dDI/AAAAAAAACoA/byoXuocvDrQ/s1600-h/img496.jpg
• http://www.ecopetrol.com.co/especiales/estadisticas2004/internacional/produccion-petroleo-opep.htm