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Cheng, L.X., Leventhal, M., Smith, D.M., et al. (1997) A Maximum Entropy Map of the 511 keV Positron Annihilation Line Emission Distribution near the Galactic Center. The Astrophysical Journal, 481, L43.
https://ui.adsabs.harvard.edu/abs/1997ApJ...481L..43C/abstract
https://doi.org/10.1086/310638
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