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\bibitem{Pogosov_etal2013} {\textquotedblleft}\textit{Electron-hole symmetry and solutions of Richardson pairing model}{\textquotedblright}. Pogosov WV, Lin N, Misko VR, European physical journal : B : condensed matter and complex systems \textbf{86}, 235 (2013).   http://doi.org/10.1140/epjb/e2013-40234-9

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