1. Electricity in Gases;Townsend,1915
2. Conduction of Electricity through Gases;Thomson,1933
3. Uber die spitzenentladung;Warburg;Wied. Ann.,1899
4. Electrical Breakdown of Gases,1978
5. A. Goldman, M. Goldman, J.E. Jones, On the behaviour of the planar current-distribution in the pulseless regime of negative DC point plane coronas in air, in: Proceedings of the Xth International Conference on Gas Discharges and Their Applications (GD92), Swansea, 1992, pp. 270–273, ISBN 0 9519465 1 X.