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\bibitem{Mukhopadhyay+Peeters2002} {\textquotedblleft}\textit{The pinning effect in a parabolic quantum dot}{\textquotedblright}. Mukhopadhyay S, Peeters FM, Journal of physics : condensed matter \textbf{14}, 8005 (2002).   http://doi.org/10.1088/0953-8984/14/34/319

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