1. United States Environmental Protection Agency (U.S. EPA). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2012;U.S. EPA:Washington, D.C. 2014.
2. Greater focus needed on methane leakage from natural gas infrastructure
3. Methane Leaks from North American Natural Gas Systems
4. Advanced Research Projects Agency-Energy (ARPA-E). Methane Observation Networks with Innovative Technology to Obtain Reductions (MONITOR);ARPA-E:Washington, D.C., 2014; http://arpa-e.energy.gov/sites/default/files/documents/files/MONITOR%20and%20DELTA%20Project%20Descriptions_Final_12.15.14.pdf.
5. Environmental Defense Fund (EDF). Methane Detectors Challenge;EDF:Washington, D.C., 2015; https://www.edf.org/energy/natural-gas-policy/methane-detectors-challenge.