1. C.I. Bibler, J.S. Marshall, R.C. Pilcher, Int. J. Coal Geol. 35, 283 (1998)
2. B.Q. Lin, S.N. Zhou, R.G. Zhang, J. China Univ. Min. Technol. 28, 104 (1999)
3. B. Metz, O. Davidson, P. Bosch, R. Dave, L. Meyer, Climate Change 2007: Mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (Cambridge University Press, Cambridge, 2007)
4. J.K. Stolaroff, S. Bhattacharyya, C.A. Smith, W.L. Bourcier, P.J. Cameron-Smith, R.D. Aines, Environ. Sci. Technol. 46, 6455 (2012)
5. Annual Energy Outlook 2011: With Projections to 2035, #DOE/EIA-0383 (U.S. Energy Information Administration, Washington, DC, 2011)