1. Highwall mining possibilities in Australia;Seib;AusIMM Bull. and Proc.,1989
2. A study of the strength of coal pillars;Salamon;J. S. Afr. Inst. Min. Metall.,1967
3. Bieniawski, Z. T., Strata Control in Mineral Engineering. A. A. Balkema, Rotterdam, 1987, p. 212
4. An hypothesis concerning pillar stability;Wilson;Min. Eng.,1972
5. Barron, K., A new method for coal pillar design. Proc. Conf. on Ground Movement and Control related to Coal Mining, ed. N. Aziz, AusIMM, Melbourne, 1986, pp. 118–124