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\bibitem{Aguilar-Saavedra_etal2017} Aguilar-Saavedra, J. A., Bernabeu, J., Mitsou, V. A., \& Segarra, A. (2017). The Z boson spin observables as messengers of new physics. \textit{Eur. Phys. J. C}, \textit{77}(4), 234--6pp.

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