Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2007 > 17 > 1 > 116-120
Journal of China University of Mining and Technology > 2007 > 17 > 4 > 479-483
Journal of China University of Mining and Technology > 2007 > 17 > 1 > 116-120
Journal of China University of Mining and Technology > 2007 > 17 > 4 > 479-483