Geodesic
Unitarity conditions for a many-body system at zero temperature
Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 420-434 
S. L. Ginzburg; S. V. Maleev. Unitarity conditions for a many-body system at zero temperature. Teoretičeskaâ i matematičeskaâ fizika, Tome 3 (1970) no. 3, pp. 420-434. http://geodesic.mathdoc.fr/item/TMF_1970_3_3_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Unitarity conditions for the Green's functions and vertex parts are derived and discussed for the zero-temperature case. The question whether the intermediate states can be described by means of quasiparticles is discussed in detail.

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