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\bibitem{Bogaerts+Grozeva2003} {\textquotedblleft}\textit{Effect of helium/argon gas ratio in a He-Ar-Cu$^{+}$ IR hollow-cathode discharge laser : modeling study and comparison with experiments}{\textquotedblright}. Bogaerts A, Grozeva M, Applied physics B : lasers and optics \textbf{76}, 299 (2003).   http://doi.org/10.1007/s00340-002-1093-3

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