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\bibitem{Lang_etal1991} Lang PT, Leipold I, Knott WJ, Semenov AD, Gol{\textquoteright}tsman GN, Renk KF. New far-infrared laser lines from CH3Cl and CH3Br optically pumped with a continuously tunable high pressure CO2 laser. Appl Phys B. 1991;53(4):207--12.

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