Mr. Chairman, they were not our studies; they were independent, third-party studies. The EPA in the U.S. was the primary author of them. They studied fracture stimulation as early as 1994. In 2004 they put out a study, in 2007 they put out a study, and they're currently undertaking another study whose results will come out in another couple of years.
So those studies exist. Many of the regulatory agencies in other parts of North America, specifically Colorado, have also put out studies, as has the regulatory agency in Pennsylvania.