BREAKDOWN OF SPHERE AND SPHERE/PLANE GAPS STRESSED WITH D.C. VOLTAGE ; THE EFFECT OF "CONDITIONING" T. E. Allibone et J. C. SaundersonJ. Phys. Colloques, 40 C7 (1979) C7-425-C7-426DOI: https://doi.org/10.1051/jphyscol:19797207