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\bibitem{DELPHICollaborationAbdallah_etal2011} DELPHI Collaboration(Abdallah, J. et al), Costa, M. J., Ferrer, A., Fuster, J., Garcia, C., Oyanguren, A., et al. (2011). Search for single top quark production via contact interactions at LEP2. \textit{Eur. Phys. J. C}, \textit{71}(2), 1555--13pp.

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