Rozell, Daniel J. and Raeven, Sheldon J.  (2011) Water Pollution Risk Associated with Natural Gas Extraction from the Marcellus Shale.  Risk Analysis, 32 (8).  pp. 1382-1393. DOI: https://doi.org/10.1111/j.1539-6924.2011.01757.x <https://doi.org/10.1111/j.1539-6924.2011.01757.x>