4William A Hustrulid, Richard L Bullock. Underground Mining Methods : Engineering Fundamentals and International Case Studies[M]. Colorado : Society for Mining Metallurgy ,2001 : 120 - 156.
5Ferreira P H. Improved technologies in longhole blast hole rilling applied to dropraising and longhole stoping as well as the application of a small twin boom mechanized drillrig[J]. The Journal of The South African Institute of Mining and Metal- lurgy ,2003 (5) : 233 - 240.
