1. L. Shevyakov, Mining of Mineral Deposits. Foreign Language Publishing House, Moscow, U.S.S.R.
2. Mine Ventilation;Skochinsky,1969
3. Outbursts of gas and coal;Lama-Mahajan;Colliery Engineering,1968
4. Outburst coal: occurrence in West Wales anthracite;Pooley;Colliery Guardian,1967
5. Present knowledge of sudden outbursts of gas;Coeuillet,1959