Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 358-362
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 321-325
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 358-362
Journal of China University of Mining and Technology > 2007 > 17 > 3 > 321-325