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\bibitem{HovenierJ.N._etal2006} Hovenier J.N., Adam A.J.L., Ka{\v s}alynas I., Gao J.R., Klaassen T.O., Baryshev A., et al. (2006). Phase-locking on the beat signal of a two-mode 2.7  terahertz metal-metal quantum cascade laser. In \textit{Proc. Symp. IEEE/LEOS Benelux Chapter} (pp. 125--128).

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