1. BP 2008 Statistical review of World energy, BP website, ; 2008 [08.10.08].
2. Hubbert MK. Exponential growth as a transient phenomenon in Human history. World Wildlife fund’s conference, the Fragile Earth: towards strategies for survival, San Francisco; 1976.
3. Laherrere J. Oil and gas: what future? Groningen annual energy convention 2006, ; 2006 [24.09.08].
4. Zittel W, Schindler J. Coal: resources and future production, energy watch group, paper no. 1/07, ; 2007 [24.09.08].
5. World Energy Council, 2007 survey of energy resources; 2007.