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\bibitem{Oleshko_etal1997} {\textquotedblleft}\textit{Observation of exciton states in silver halide nanoparticles by cryo-electron spectroscopic imaging and electron energy-loss spectroscopy}{\textquotedblright}. Oleshko VP, Brichkin SB, Gijbels R, Jacob WA, Razumov VF, Mendeleev communications \textbf{7}, 213 (1997)

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