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\bibitem{Kong_etal2017} {\textquotedblleft}\textit{Numerical analysis of direct-current microdischarge for space propulsion applications using the particle-in-cell/Monte Carlo collision (PIC/MCC) method}{\textquotedblright}. Kong L, Wang W, Murphy AB, Xia G, Journal of physics: D: applied physics \textbf{50}, 165203 (2017).   http://doi.org/10.1088/1361-6463/AA623F

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