Investigation on creeping discharges propagating over epoxy resin and glass insulators in the presence of different gases and mixturesA. Beroual, M.L. Coulibaly, O. Aitken and A. GirodetEur. Phys. J. Appl. Phys., 56 3 (2011) 30802DOI: https://doi.org/10.1051/epjap/2011110122