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New development of longwall mining equipment based on automation and intelligent technology for thin seam coal[J] . Guo-fa Wang.Journal of Coal Science and Engineering (China) . 2013 (1)
[12]
Analysis of support by hydraulic props in a longwall working[J] . C. González-Nicieza,A. Menéndez-Díaz,A.E. álvarez-Vigil,M.I. álvarez-Fernández.International Journal of Coal Geology . 2007 (1)