1. Hargreaves DM, Moloney KW, Pearce W, Lowndes IS. Validation of computational models of auxiliary ventilation systems with experimental data. Proceedings of the eigth US Mine Ventilation Systems, Rollo, SME.
2. Creedy DP, Saghafi A, Lama R. Gas control in underground coal mining, IEA Coal Research, 1997, ISBN: 92-9029-280-6.
3. Whittles DN. Application of rock mass classification principles to coal mine design. PhD thesis, University of Nottingham, 1999.
4. Itasca Consulting Group Inc. FLAC Version 4 Users manual. Itasca, Consulting Group, Inc., Minneapolis, 2000.
5. Mohammad N. An investigation into the effect of stress on the permeability of rock taken from carboniferous strata. PhD thesis, University of Nottingham, 1971.