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\bibitem{Aguilar_etal2012} Aguilar, A. C., Iba{\~n}ez, D., Mathieu, V., \& Papavassiliou, J. (2012). Massless bound-state excitations and the Schwinger mechanism in QCD. \textit{Phys. Rev. D}, \textit{85}(1), 014018--21pp.

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