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Structure of the mass operator in finite Fermi systems
Teoretičeskaâ i matematičeskaâ fizika, Tome 52 (1982) no. 3, pp. 431-442 Cet article a éte moissonné depuis la source Math-Net.Ru

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The field methods of many-body theory are used to consider the structure of the mass operator in finite Fermi systems. It is shown to have a pole dependence on the energy. Various approximate methods of determining it are discussed. The general properties of the quasiparticle spectrum are investigated on the basis of the obtained form of the mass operator. 
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     author = {V. I. Belyak and G. M. Vagradov},
     title = {Structure of the mass operator in finite {Fermi} systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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}
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V. I. Belyak; G. M. Vagradov. Structure of the mass operator in finite Fermi systems. Teoretičeskaâ i matematičeskaâ fizika, Tome 52 (1982) no. 3, pp. 431-442. http://geodesic.mathdoc.fr/item/TMF_1982_52_3_a9/

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