Plasma excitation dispersion in non-degenerate quantum wire over liquid helium Tatiana N. Antsygina, Konstantin A. Chishko, Igor A. Degtyaryov, Igor I. Poltavsky, Sviatoslav S. Sokolov and Nelson Studart Eur. Phys. J. B, 90 5 (2017) 79 Published online: 02 May 2017 DOI: 10.1140/epjb/e2017-70627-5