1. Shale gas: a global resource;Boyer;Oilfield Rev,2011
2. Shale gas: applying technology to solve America's energy challenges;DOE,2011
3. The shale gas revolution: developments and changes;Stevens,2012
4. Porosity and permeability of eastern Devonian gas shale;Soeder;SPE Form Eval,1988
5. Waterfracs: we do need proppant after all;Britt,2006