7Chien (Q Jan) Minggao. A study of the behavior of overlying strata in longwall-mining and its applica tion to strata control.Strata Mechanics[M].Elsevier Scintilla Publishing Company,1982.
8Oyler,DavidC.Mark,Christopher.Dolinar,Dennis R. A study of the ground control effects of mining longwall faces into open or backfilled entries[J].Geotechnical and Geological Engineering,2001.