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\bibitem{Grujic_etal2012} {\textquotedblleft}\textit{Interband optical absorption in a circular graphene quantum dot}{\textquotedblright}. Gruji{\'c} M, Zarenia M, Tadi{\'c} M, Peeters FM, Physica scripta \textbf{T149}, 014056 (2012).   http://doi.org/10.1088/0031-8949/2012/T149/014056

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