Excessive hydrogen and deuterium Balmer lines broadening in a hollow cathode glow discharges N. M. Šišović, G. Lj. Majstorović and N. Konjević Eur. Phys. J. D, 32 3 (2005) 347-354 Published online: 04 January 2005 DOI: 10.1140/epjd/e2004-00192-1