7Sastri S, Reddy P, Bhattacharyya K, et al. Recovery of coal fines using column flotation [J]. Minerals Engineering, 1988, 1 (4): 359-363.
8Kolker A, Panov B, Landa E, et al. Mercury and trace element contents of Donbas coals and associated mine water in the vicinity of Donetsk, Ukraine [J]. International Journal of Coal Geology, 2009, 79(3) :83-91.
9Kinnon E, Golding S, Boreham C, et al. Stable isotope and water quality analysis of coal bed methane production waters and gases from the Bowen Basin, Australia [J]. International Journal of Coal Geology, 2010, 82(3-4):219-231.
10Asokan P, Saxena M, Asolekar S. Coal combustion residues environmental implications and recycling potentials [J]. Resources, Conservation and Recycling, 2005, 43(3):239-262.
