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Journal of Natural Gas Science and Engineering > 2017 > 45 > C > 797-811
International Journal of Mining Science and Technology > 2017 > 27 > 4 > 681-685
Journal of Coal Science and Engineering (China) > 2011 > 17 > 3 > 316-320
2009 Fifth International Conference on Natural Computation > 6 > 397 - 400