3Colley P. Investment practices in Australian coal: the practice and profit of quasiqntegration in the Australia-Japan coal trade [J]. Energy Policy, 1997, 5 (12) : 1013 - 1025.
4Pahle M. Germany's dash for coal: exploring drivers and factors [J]. Energy Policy, 2010, 38 (7) : 3431 - 3442.
5Fan Y, Yang R G, Wei Y M. A system dynamics based model for coal investment[J].Energy, 2007, 32 (6): 898 - 905.
6Ning Yuneai, Chen Xiang. Coal mine safety investment prediction based on wavelet neural network [C] // Proceedings of 2009 International Conference on Future Information Technology and Management Engineering FITME2009. Sanya, China: lEER, 2009:242-245.
7Chen Xiang, Cai Weihua, Chen Na. Coal mine safety in vestment prediction based on support vector machine [C] // Proceedings of The 5th International Conferenceon Natural Computation, ICNC'09. Tianjin, China: [s. n. ], 2009:199 - 202.