VARIATION OF CORONA INCEPTION AND SPARKOVER WITH POSITIVE IMPULSE VOLTAGE IN A ROD/PLANE GAP : EFFECT OF NEGATIVE SMALL ION VARIATION N. L. Allen, T. E. Allibone et D. DringJ. Phys. Colloques, 40 C7 (1979) C7-423-C7-424DOI: https://doi.org/10.1051/jphyscol:19797206