1. Airey, E.M. (1968) Gas emission from broken coal. An experimental and theoretical investigation.International Journal of Rock Mechanics and Mining Science 5, 6, 475?94.
2. Airuni, A.T., Ettinger, I.L., Zverev, I.V. and Dolgova, M.O. (1983) The role of sorptive stress of solid solutions of methane in coals in the evolution of a sudden outburst, inProceedings of the 20th International Conference of Safety in Mines Research Institutes, Sheffield, UK 3?7 October 1983. Paper B8, HSE Trans. Services, Buxton, 11 p.
3. Artemov, A.V. and Frolkov, G.D. (1977) Forecasting an outburst hazard from the concentration of paramagnetic centres.Ugol, 5, HSE Trans. No. 9975, pp. 22?4.
4. Barker-Read, G.R. (1980) The geology and related aspects of coal and gas outbursts in the Gwendraeth Valley, MSc thesis, University of Wales (Cardiff).
5. Barker-Read, G.R. (1984) The gas-dynamic behaviour of Coal Measures strata with particular reference to west Wales outburst-prone seams, PhD thesis, University of Wales (Cardiff).