Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2007 > 17 > 2 > 262-266
Journal of China University of Mining and Technology > 2008 > 18 > 4 > 556-560
Journal of China University of Mining and Technology > 2007 > 17 > 2 > 262-266
Journal of China University of Mining and Technology > 2008 > 18 > 4 > 556-560