Plasma-wall interactions in DC discharges and sheath of Langmuir probes A. Cenian, H. Rachubinski, A. Chernukho and M. Dudeck Eur. Phys. J. Special Topics, 222 9 (2013) 2143-2156 Published online: 23 October 2013 DOI: 10.1140/epjst/e2013-01991-y