Zhang Yun-dong, Zhao Xing. International Situation of Coal-to-Synthetic Gas Technology Patents[J]. Petroleum Science and Technology Forum, 2009, 28(4): 59-62.
[1] Derwent Innovations Index.http://www.thomsoninnovation.com.
[2] Ruby J,Kramer S,Hobbs R,et al.Substitute Natural Gas from Coal Co Production Project a Status Report,2008.
[3] Climate Change Policy Partnership.Synthetic Natural Gas(SNG):Technology,Environmental Implications,and Economics,2009.
[4] Substitute Natural Gas from Coal-Japanese Market Demand.http://www.australiancoal.csiro.au.