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http://pifecopetrol-daniel.blogspot.com/2011/11/marketing-mix.htmlhttp://marketing-energetico.blogspot.com/2010/07/ecopetrol-nueva-imagen.htmlhttp://www.ecopetrol.com.co/especiales/carta_petrolera120/rev_gestion.htmhttp://campus.uonline.cl/mod/resource/view.php?id=74402