1. Bieniawski ZT (1982) Improved design of coal pillars for US mining conditions. In: proceedings of the first international conference on stability in underground mining, Vancouver, Canada, pp.16–18
2. Bieniawski ZT (1995) Design of mine pillars for long-term stability. In: proceedings of the international high-tech conference on geoengineering, national mining university of Beijing, China, 245–257 pp
3. Dong SN (2010) Integrated in-stu tests for water inrush possibility evaluation in coal seam floors. J Eng Geol 18(1):116–119
4. Fang PX, Wei ZD, Liao ZS (1987) Special hydrogeology. Geological Publishing House, Wuhan, pp 261–263
5. Gidley JL, Holditch SA, Nierode DE (1989) Recent advances in hydraulic fracture. Society petroleum engineering monograph, 119–204 pp