Z. T. Bieniawski and W. L. Van-heerden, The significance of in situ tests on large rock specimens, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, vol.12, issue.4, 1975.
DOI : 10.1016/0148-9062(75)90004-2

B. H. Brady and E. T. Brown, Rock Mechanics for Underground Mining, 1993.

C. Didier and J. P. Josien, Importance of failure mechanisms for management of surface instability risk above abandoned mines, Proc. 10 th ISRM Congress, pp.243-248, 2003.
URL : https://hal.archives-ouvertes.fr/ineris-00972429

D. Grgic, F. Homand, and A. Giraud, Modelling of the drying and flooding of underground iron mines in Lorraine (France), International Journal of Rock Mechanics and Mining Sciences, vol.43, issue.3, pp.388-407, 2006.
DOI : 10.1016/j.ijrmms.2005.07.004

E. Hoek and E. T. Brown, Underground Excavations in Rock. The Institution of Mining and Metallurgy, 1980.

C. T. Holland, The strength of coal in mine pillars, Proc. 6th Symp. on Rock Mech., Univ. Of Missouri, pp.450-466, 1964.

C. T. Holland, Pillar design for support of the overburden in coal mines, Proc. 9 th Can. Symp. Rock Mech, pp.114-139, 1973.

W. A. Hustrulid, A review of coal pillar strength formulas, Rock Mechanics Felsmechanik M???canique des Roches, vol.7, issue.2, pp.115-145, 1976.
DOI : 10.1007/BF01239762

B. J. Madden, A re-assessment of coal pillar design, J. S. Afr. Inst. Min. Metall, pp.27-37, 1991.

L. Obert and W. Duvall, Rock mechanics and the design of structure in Rock, 1967.

M. D. Salamon, A Method for Designing Bord and Pillar Workings, J. South Afr. Inst. Min. Metall, vol.68, pp.68-78, 1967.

M. D. Salamon and A. H. Munro, A study of the strength of coal pillars, J. S. Afr. Inst. Min. Metall, pp.56-67, 1967.

M. D. Salamon, Unpublished report to Wankie Colliery Van der Merwe Revised strength factor for coal in the Vaal Basin, J.N. J. S. Afr. Inst. Min. Metall, pp.71-77, 1982.

J. N. Van-der-merwe, Handbook: Practical coal mining strata control, ITASCA Africa (Pty) Ltd, 1998.

J. N. Van-der-merwe, Linear coal pillar strength formula for South African Coal, J. S. Afr. Inst. Min. Metall, pp.281-292, 2003.

J. N. Van-der-merwe, South African coal pillar data bases, J. S. Afr. Inst. Min. Metall, pp.115-128, 2006.

J. N. Van-der-merwe, Beyond Coalbrook: what did we really learn?, J. S. Afr. Inst. Min. Metall, vol.106, pp.857-868, 2006.

M. Villot, Note sur la propagation latérale des mouvements d'effondrement dans les mines, Annales des Mines, 1889.