1. CO2 foam as an improved fracturing fluid system for unconventional reservoir;Ahmed,2019
2. Foam fracturing utilizing delayed crosslinked gels;Craighead,1985
3. Integrative Understanding of Shale Gas Reservoirs;Lee,2016
4. PS what are unconventional resources? A simple definition using viscosity and permeability;Cander,2012
5. The Unconventional Hydrocarbon Resources of Britain's Onshore Basins: Shale Gas;Department of Energy and Climate Change,2013