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2. http://energy.gov/eere/sunshot/concentrating-solar-power-efficiently-leveraging-equilibrium-mechanisms-engineering-new
3. A Review of Ammonia-Based Thermochemical Energy Storage for Concentrating Solar Power
4. G. Gill and G. Cowan, Adavale Basin, Queensland Underground Salt Cavern Potential, http://www.innovativeenergy.com.au/saltcavern/article%20for%20mining%20journal.pdf, (2008).
5. http://www.eia.gov/naturalgas/, 2008.