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 Cet article a éte moissonné depuis la source Math-Net.Ru

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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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     title = {Calculation of single-photon exchange diagrams in the quasipotential approach by means of the polarization operator},
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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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