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\bibitem{Kundys_etal2018} {\textquotedblleft}\textit{Nonlinear light mixing by graphene plasmons}{\textquotedblright}. Kundys D, Van Duppen B, Marshall OP, Rodriguez F, Torre I, Tomadin A, Polini M, Grigorenko AN, Nano letters \textbf{18}, 282 (2018).   http://doi.org/10.1021/ACS.NANOLETT.7B04114

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