8Kanamura T.. A supply and demand based volatility model for energy prices[J]. Energy Economics, 2009,31 (5) : 736-747.
9Ellerman A D. The world price of coal[J]. Energy Policy, 1995,23 (6) : 499-506.
10Anne-Marie B, Robert P, Douglas S, et al. Oil Price Develop- ments: Drivers, Economic Consequences and PoLicy Responses [R}. OECD Economics Working Paper, No.412,2004.