Geodesic
Dyson equation for spin Green's functions
Teoretičeskaâ i matematičeskaâ fizika, Tome 56 (1983) no. 1, pp. 149-153

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It is shown that Dyson's method for separating irreducible diagrams can be used in the diagram technique for spin operators. This method is used to obtain an equation for the transverse spin Green's function of a Heisenberg ferromagnet. 
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     author = {V. G. Bar'yakhtar and V. N. Krivoruchko and D. A. Yablonskii},
     title = {Dyson equation for spin {Green's} functions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1983_56_1_a14/}
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V. G. Bar'yakhtar; V. N. Krivoruchko; D. A. Yablonskii. Dyson equation for spin Green's functions. Teoretičeskaâ i matematičeskaâ fizika, Tome 56 (1983) no. 1, pp. 149-153. http://geodesic.mathdoc.fr/item/TMF_1983_56_1_a14/