1. Robertson , C. 2010 Oil leaking underwater from well in rig blast. New York Times http://www.nytimes.com/2010/04/25/us/25rig.html
2. Robertson , C. Kaufman , L. 2010 Size of spill in Gulf of Mexico is larger than thought. New York Times http://www.nytimes.com/2010/04/29/us/29spill.html