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\bibitem{Tognalii_etal2011} {\textquotedblleft}\textit{From single to multiple Ag-layer modification of Au nanocavity substrates : a tunable probe of the chemical surface-enhanced Raman scattering mechanism}{\textquotedblright}. Tognalii NG, Cort{\'e}s E, Hern{\'a}ndez-Nieves AD, Carro P, Usaj G, Balseiro CA, Vela ME, Salvarezza RC, Fainstein A, ACS nano \textbf{5}, 5433 (2011).   http://doi.org/10.1021/nn200567m

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