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\bibitem{ATLASCollaborationAaboud_etal2019} ATLAS Collaboration(Aaboud, M. et al), Alvarez Piqueras, D., Aparisi Pozo, J. A., Bailey, A. J., Barranco Navarro, L., Cabrera Urban, S., et al. (2019). Search for excited electrons singly produced in proton-proton collisions at root s=13 TeV with the ATLAS experiment at the LHC. \textit{Eur. Phys. J. C}, \textit{79}(9), 803--30pp.

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