Geodesic
Calculation of single-photon exchange diagrams in the quasipotential approach by means of the polarization operator
Teoretičeskaâ i matematičeskaâ fizika, Tome 12 (1972) no. 1, pp. 56-63 
N. E. Nyun'ko; Yu. N. Tyukhtyaev. Calculation of single-photon exchange diagrams in the quasipotential approach by means of the polarization operator. Teoretičeskaâ i matematičeskaâ fizika, Tome 12 (1972) no. 1, pp. 56-63. http://geodesic.mathdoc.fr/item/TMF_1972_12_1_a5/
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     title = {Calculation of single-photon exchange diagrams in the quasipotential approach by means of the polarization operator},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {56--63},
     year = {1972},
     volume = {12},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_12_1_a5/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The contribution to the hyperfine shift of the positronium ground level is calculated to order $\alpha^6$ on the basis of an expression for the polarization operator deduced from a quasipotential equation.

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