http://en.wikipedia.org/wiki/2013_Pemex_explosion
http://www.hazardexonthenet.net/article/55896/Fatal-explosion-and-fire-devastates-Pemex-HQ-in-Mexico-City.aspx?AreaID=2
http://www.guardian.co.uk/world/2013/jan/31/mexico-americas
http://www.reuters.com/article/2013/02/01/us-mexico-pemex-idUSBRE90U1FF20130201
http://www.bbc.co.uk/news/world-latin-america-21288214,
http://www.infopig.com/keywords/explosion.html
http://www.euronews.com/2013/02/01/casualties-expected-to-rise-in-fatal-mexico-city-tower-explosion
http://en.wikipedia.org/wiki/Torre_Ejecutiva_Pemex:
http://skyscraperpage.com/diagrams/?countryID=23
http://en.wikipedia.org/wiki/Category:Disasters_in_Mexico,
http://www.bbc.co.uk/news/world-latin-america-18170525