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\bibitem{Hai_etal2018} {\textquotedblleft}\textit{Electron pairing: from metastable electron pair to bipolaron}{\textquotedblright}. Hai G-Q, Candido L, Brito BGA, Peeters FM, Journal of physics communications \textbf{2}, Unsp 035017 (2018).   http://doi.org/10.1088/2399-6528/AAAEE0

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