9LI Liangjun,WU Yanbin. The influence of time on subsidence in the Central Asturian Coalfield[J]. Bull Eng Geol Environ,2007, 66:319-329.
10BLACHOWSKI J, ELLEFMO S, LUDVIGSEN E. Monitoring system for observations of rock mass deformations caused by sub|eve| caving mining system [ J ]. Acta Geodynamica et Geomaterialia ,2011 ( 8 ) :335-344.
