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\bibitem{Mumma_etal1975} Mumma, M., Kostiuk, T., Cohen, S., B{\"u}hl, D., \& Von Thuna, P. C. (1975). Heterodyne spectroscopy of astronomical and laboratory sources at 8.5 $\mu$m using diode laser local oscillators. \textit{Space Science Reviews}, \textit{17}(5), 661--667.

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