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Prakhov, S., B. Nefkens, C. Allgower, V. Bekrenev, W. Briscoe, J. Comfort, K. Craig, et al. 2008. “Measurement of the Invariant-Mass Spectrum for the Two Photons from the η→π0γγ Decay”. Physical Review C. https://doi.org/10.1103/PhysRevC.78.015206.
Prakhov, S., et al. Measurement of the Invariant-Mass Spectrum for the Two Photons from the η→π0γγ Decay. Physical Review C, 1 July 2008, https://doi.org/10.1103/PhysRevC.78.015206.