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Crut, Aurélien; Juvé, Vincent; Mongin, Denis; Maioli, Paolo; Del Fatti, Natalia; Vallée, Fabrice. (2011). Vibrations of spherical core-shell nanoparticles. , 83(20), 205430–0. doi:10.1103/physrevb.83.205430 
10.1103/physrevb.83.205430