Electron excitation of neutral and ionic levels in Townsend discharges of argon at high E/N G. N. Malović, J. V. Božin, B. M. Jelenković and Z. Lj. Petrović Eur. Phys. J. D, 7 1 (1999) 129-135 Published online: 15 August 1999 DOI: 10.1007/s100530050357