Journal of China University of Mining and Technology
Journal of China University of Mining and Technology > 2007 > 17 > 2 > 255-257
Journal of China University of Mining and Technology > 2008 > 18 > 3 > 413-417
Journal of China University of Mining and Technology > 2007 > 17 > 2 > 255-257
Journal of China University of Mining and Technology > 2008 > 18 > 3 > 413-417