Geodesic
Effective electron-electron interaction in a~group-theoretical diagram technique
Teoretičeskaâ i matematičeskaâ fizika, Tome 34 (1978) no. 2, pp. 256-266

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A method is developed for determining the effective interaction by means of grouptheoretical diagrams. Their general properties are considered with a view to simplifying the summation of perturbation series and justifying decouplings. 
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     author = {M. F. Olekseeva and K. D. Tovstyuk},
     title = {Effective electron-electron interaction in a~group-theoretical diagram technique},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1978_34_2_a11/}
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M. F. Olekseeva; K. D. Tovstyuk. Effective electron-electron interaction in a~group-theoretical diagram technique. Teoretičeskaâ i matematičeskaâ fizika, Tome 34 (1978) no. 2, pp. 256-266. http://geodesic.mathdoc.fr/item/TMF_1978_34_2_a11/