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\bibitem{Nikolaev+Michel2009} {\textquotedblleft}\textit{Elusive s-f intrasite interactions and double exchange in solids: ferromagnetic versus nonmagnetic ground state}{\textquotedblright}. Nikolaev AV, Michel KH, Journal of experimental and theoretical physics \textbf{109}, 286 (2009).   http://doi.org/10.1134/S1063776109080147

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