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\bibitem{Stefanis_etal2013} Stefanis, N. G., Bakulev, A. P., Mikhailov, S. V., \& Pimikov, A. V. (2013). Can we understand an auxetic pion-photon transition form factor within QCD? \textit{Phys. Rev. D}, \textit{87}(9), 094025--13pp.

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