1. http://www.powerengineeringint.com/articles/print/volume-21/issue-7/regulars/new-analysis/in-the-dark-on-the-reality-of-blackouts.html
2. (Env. Defense Fund): Methane: A Crucial Opportunity in the Climate Fight,2023
3. Mineralogy and geomechanical analysis for hydraulic fracturing: an integrated approach to assess rock fracability in sandstone reservoirs;Alsaif,2017
4. Technically Recoverable Shale Oil and Shale Gas Resources: An Assessment of 137 Shale Formations in 41 Countries outside the United States,2013
5. An assessment of world hydrocarbon resources;Rogner;Annu. Rev. Energy Environ.,1999