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\bibitem{Matsushima_etal1994} Matsushima, F., Odashima, H., Iwasaki, T., Tsunekawa, S., \& Takagi, K. (1994). Frequency measurement of pure rotational transitions of H$_{2}$O from 0.5 to 5 THz. In \textit{Conference on precision electromagnetic measurements digest} (pp. 23--24).

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