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2. The unipolar corona space charge flow problem;Sigmond;J. Electrostat.,1986
3. G. Gela, Computation of ionized fields associated with unipolar DC transmission systems, Department of Electrical Engineering, University of Toronto, Toronto, Canada, April 1980.
4. N.J. Felici. Recent advances in the analysis of DC ionised electric fields—Part I, Direct Current, pp. 252–260, September 1963.
5. Electrical Coronas;Loeb,1965