Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 393-398
Journal of China University of Mining and Technology > 2007 > 17 > 4 > 552-556
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 393-398
Journal of China University of Mining and Technology > 2007 > 17 > 4 > 552-556