[1] [1] Pone J D, Hein K A, Stracher G B, et al. International Journal of Coal Geology, 2007, 72: 124.

[2] [2] Querol X, Izquierdo M, Monfort E, et al. International Journal of Coal Geology, 2008, 75: 93.

[3] [3] Liu H B, Liu Z L. Resources, Conservation and Recycling. 2010, 54: 1331.

[4] [4] Fan G W, Zhang D S, Wang X F. Resources, Conservation and Recycling, 2014, 83: 24.

[5] [5] Yassine Taha, Mostafa Benzaazoua, Rachid Hakkou, et al. Minerals Engineering, 2017, 107: 123.

[6] [6] Chugh Y P, Patwardhan A. Resources, Conservation and Recycling, 2004, 40: 225.

[7] [7] Zhang J X, Deng X J, Zhao F J, et al. International Journal of Mining, Eclamation and Environment, 2017, 31(2): 91.

[8] [8] Frias M, Villa R, Rojas M, et al. Journal of America Ceramic Society, 2012, 95(1): 386.

[9] [9] Wang Y S, Yang M, Wei G, et al. Sensors and Actuators B: Chemical, 2014, 193: 723.

[10] [10] Mao Y C, Liu S J, Wu L X, et al. Canadian Journal of Remote Sensing, 2014, 40(5): 327.

[12] [12] Leo Breiman. Machine Learning, 2001, 45(1): 5.

[13] [13] Daniel R G, Wade A W, Andrew J F, et al. Journal of Terramechanics, 2016, 65: 85.

[14] [14] Diamantidis N A, Karlis D, Giakoumakis E A. Artificial Intelligence, 2000, 116: 1.