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\bibitem{Risacher_etal2009} Risacher, C., Meledin, D., Belitsky, V., \& Bergman, P. (2009). First 1.3 THz observations at the APEX telescope. In \textit{Proc. 20$^{th}$ Int. Symp. Space Terahertz Technol.} (pp. 54--61).

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