1. Bell FG (2004) Engineering geology and construction. Spon Press, London
2. Benson RC et al (2000) Stabilization against geologic instability-underground documentation of a mine backfilling case history. ASCE Geo-Denver Conference Denver, Colorado, 5–8 August 2000
3. Brink ABA (1984) A brief review of the South African sinkhole problem. In: Beck BF (ed) Proceedings of the 1st multidisciplinary conference on sinkholes: their geology, engineering and environmental impact, Orlando, Florida. Balkema, Rotterdam, pp 123–127
4. Davies WE (1951) Mechanics of cave breakdown. Natl Speleol Soc Bull Number 13:36–43
5. Davis C (2002) Exposing Tennessee’s titanic cave chamber. National Geographic Adventure Magazine, March 4(2): on-line extra at www.nationalgeographic.com