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\bibitem{Doria_etal2010} {\textquotedblleft}\textit{The ground states of the two-component order parameter superconductor}{\textquotedblright}. Doria MM, de Romaguera ARC, Peeters FM, Europhysics letters \textbf{92}, 17004 (2010).   http://doi.org/10.1209/0295-5075/92/17004

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