Four-electrodes DBD plasma jet device with additional floating electrode Fellype do Nascimento, Munemasa Machida, Konstantin G. Kostov and Stanislav Moshkalev Eur. Phys. J. D, 74 1 (2020) 14 Published online: 24 January 2020 DOI: 10.1140/epjd/e2019-100343-9