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\bibitem{Buchta_etal2014} Buchta, S., Chachamis, G., Draggiotis, P., Malamos, I., \& Rodrigo, G. (2014). On the singular behaviour of scattering amplitudes in quantum field theory. \textit{J. High Energy Phys.}, \textit{11}(11), 014--13pp.

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