Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2008 > 18 > 3 > 395-400
Journal of China University of Mining and Technology > 2008 > 18 > 4 > 634-636
Journal of China University of Mining and Technology > 2008 > 18 > 3 > 395-400
Journal of China University of Mining and Technology > 2008 > 18 > 4 > 634-636