Geodesic
Critical-point singularities.~I. The critical-point condition and the susceptibility
Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 1, pp. 111-124

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Equilibrium many-particle systems in the critical region are discussed. An order parameter is introduced as a quasiaverage defined in accordance with the method of N. N. Bogolynbov Jr. A generalized critical-point condition is formulated and special cases of it discussed. Rigorous expressions are obtained for the susceptibility in the disordered phase. 
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     author = {V. N. Plechko},
     title = {Critical-point {singularities.~I.} {The} critical-point condition and the susceptibility},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {111--124},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1981_46_1_a10/}
}
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V. N. Plechko. Critical-point singularities.~I. The critical-point condition and the susceptibility. Teoretičeskaâ i matematičeskaâ fizika, Tome 46 (1981) no. 1, pp. 111-124. http://geodesic.mathdoc.fr/item/TMF_1981_46_1_a10/