1. ‘Pillar stability in large underground openings: application from a case study in competent jointed rock’;Agapito;Colorado School of Mines Quarterly,1986
2. Subsidence Engineer's Handbook;Proctor,1975
3. ‘Salt and subsidence in Cheshire, England’;Bell;Engg Geol.,1975
4. ‘Location of abandoned workings in coal seams’;Bell;Bull. Int. Ass. Engg Geol.,1986
5. ‘Subsidence associated with the abstraction of fluids’;Bell,1988