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Fine Structure Splitting in the Ground State of Positronium
Phys. Rev. 85, 489 – Published 1 February, 1952
DOI: https://doi.org/10.1103/PhysRev.85.489.2
Phys. Rev. 85, 489 – Published 1 February, 1952
DOI: https://doi.org/10.1103/PhysRev.85.489.2