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\bibitem{Covaci_etal2010} {\textquotedblleft}\textit{Efficient numerical approach to inhomogeneous superconductivity: the Chebyshev-Bogoliubov-de Gennes method}{\textquotedblright}. Covaci L, Peeters FM, Berciu M, Physical review letters \textbf{105}, 167006 (2010).   http://doi.org/10.1103/PhysRevLett.105.167006

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