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\bibitem{Shanenko_etal2011} {\textquotedblleft}\textit{Extended Ginzburg-Landau formalism for two-band superconductors}{\textquotedblright}. Shanenko AA, Milo{\v s}evi{\'c} MV, Peeters FM, Physical review letters \textbf{106}, 047005 (2011).   http://doi.org/10.1103/PhysRevLett.106.047005

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