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\bibitem{Li_etal2008} Li, T. F., Pashkin, Y. A., Astafiev, O., Nakamura, Y., Tsai, J. S., \& Im, H. (2008). High-frequency metallic nanomechanical resonators. \textit{Appl. Phys. Lett.}, \textit{92}, 043112(1)-043112(3).

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