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\bibitem{Hai+Peeters2015} {\textquotedblleft}\textit{Hamiltonian of a many-electron system with single-electron and electron-pair states in a two-dimensional periodic potential}{\textquotedblright}. Hai G-Q, Peeters FM, European physical journal : B : condensed matter and complex systems \textbf{88}, 20 (2015).   http://doi.org/10.1140/epjb/e2014-50686-x

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