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\bibitem{Torre_etal2019} {\textquotedblleft}\textit{Acoustic plasmons at the crossover between the collisionless and hydrodynamic regimes in two-dimensional electron liquids}{\textquotedblright}. Torre I, de Castro LV, Van Duppen B, Barcons Ruiz D, Peeters FM, Koppens FHL, Polini M, Physical review B \textbf{99}, 144307 (2019).   http://doi.org/10.1103/PHYSREVB.99.144307

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