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An expression for the increase of the minimum of breakdown voltage is derived for the transition from plane to cylindrical geometry. The resulting breakdown voltage as a function of the reduced distance between inner and outer electrode, (R2-R1) p shows that for values of (R2-R1) p above the minimum the breakdown voltage decreases by changing from plane to cylindrical geometry. The production of charges is described by the wellknown ionization coefficient Â¿/p depending on the local electric field E/p. Further it is shown that violations of the similarity theorem can not be caused by non-equilibrium ionization as postulated by G. R. G. Raju and R. Hackam. Similarity only fails if certain volume or wall processes become predominant.