Geodesic
Bogolyubov's inequalities in systems of many interacting particles with broken symmetry
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 3, pp. 368-393

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On the basis of the concept of quasiaverages and Bogolyubov's inequalities for the commutator Green's functions, we discuss some problems in many-particle systems in which spontaneous symmetry breaking is manifested physically in quite different ways: the Ising model, the Heisenberg model with ferro-, antiferro-, and ferrimagnetic ordering, systems of superfluid and superconducting type, and a system with crystalline ordering. 
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     author = {B. I. Sadovnikov and V. K. Fedyanin},
     title = {Bogolyubov's inequalities in systems of many interacting particles with broken symmetry},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {368--393},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_16_3_a9/}
}
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B. I. Sadovnikov; V. K. Fedyanin. Bogolyubov's inequalities in systems of many interacting particles with broken symmetry. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 3, pp. 368-393. http://geodesic.mathdoc.fr/item/TMF_1973_16_3_a9/