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[1407.6913] Ortho-positronium observation in the Double Chooz Experiment http://t.co/SBkQUwEyDa
[1407.6913] Ortho-positronium observation in the Double Chooz Experiment http://t.co/SBkQUwEyDa
Ortho-positronium observation in the Double Chooz Experiment. http://t.co/UEORtk32UD