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4. V. N. Ochkin, Spectroscopy of Low Temperature Plasma (Wiley, New York, 2009).
5. J. H. van Helden, S. J. Horrocks, and G. A. D. Ritchie, “Application of quantum cascade lasers in studies of low-pressure plasmas: Characterization of rapid passage effects on density and temperature measurements,” Appl. Phys. Lett. 92 (8), 081506 (2008). https://doi.org/10.1063/1.2885725