1. Yang, C-J. & Jackson, R. B. Energy Policy 41, 878–884 (2012).
2. Li, D. Coal Chemical Industry 133, 1–7 (2007). [in Chinese]
3. Liu, Z., Gong, H. & Yu, L. Coal Chemical Industry 141, 1–5 (2009). [in Chinese]
4. Fu, G. & Chen, C. Sino-Global Energy 15, 28–34 (2010). [in Chinese]
5. Synthetic Fuels: An Overview of DOE's Ownership and Divestiture of the Great Plains Project (US General Accounting Office, 1989).