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\bibitem{Riva_etal2004} {\textquotedblleft}\textit{Charged donors in quantum dots: finite difference and fractional dimensions results}{\textquotedblright}. Riva C, Escorcia RA, Govorov AO, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{69}, 245306 (2004).   http://doi.org/10.1103/PhysRevB.69.245306

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