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Rothermel H, Käufl HU, Yu Y. A heterodyne spectrometer for astronomical measurements at 10 micrometers. A&A. 1983;126:387–92.
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Johnson MA, Betz AL, McLaren RA, Townes CH, Sutton EC. Nonthermal 10 micron CO2 emission lines in the atmospheres of Mars and Venus. A&A. 1976;208:145.
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