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\bibitem{Andreev_etal2023} Andreev, Y. M. et al, Molina Bueno, L., \& Tuzi, M. (2023). Measurement of the intrinsic hadronic contamination in the NA64-e high-purity e+/e- beam at CERN. \textit{Nucl. Instrum. Methods Phys. Res. A}, \textit{1057}, 168776--8pp.

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