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\bibitem{ATLASCollaborationAad_etal2014} ATLAS Collaboration(Aad, G. et al), Cabrera Urban, S., Castillo Gimenez, V., Costa, M. J., Fassi, F., Ferrer, A., et al. (2014). Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in root s=8 TeV pp collisions with the ATLAS detector. \textit{Eur. Phys. J. C}, \textit{74}(6), 2883--25pp.

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