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\bibitem{Mygind_etal2005} Mygind, J., Samuelsen, M. R., Koshelets, V. P., \& Sobolev, A. S. (2005). Simple theory for the spectral. linewidth of the mm-wave Josephson flux flow oscillator. In \textit{Pi-shift Workshop {\textquotedblleft}Physics of superconducting phase-shift devices{\textquotedblright}} (p. 22). Ischia, Italy.

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