The study of micro-arc discharges during cathodic plasma electrolysis of refractory metals using the spectral line shape of Na I linesJovica Jovović, Stevan Stojadinović, Nenad Tadić, Rastko Vasilić and Nikola M. ŠišovićEPL, 113 6 (2016) 68001DOI: https://doi.org/10.1209/0295-5075/113/68001