Geodesic
Diagram technique in field theory at finite temperature
Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 2, pp. 181-191

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A diagram technique is proposed for calculating the free energy and effective potential in relativistic field theory at finite temperature. It is similar to but differs from the real-time formalism of Dolan and Jackiw, which, as will be shown, contains redundant diagrams. The technique is most convenient for systematic low-temperature expansion. 
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     author = {R. L. Mkrtchyan},
     title = {Diagram technique in field theory at finite temperature},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {181--191},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_65_2_a2/}
}
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R. L. Mkrtchyan. Diagram technique in field theory at finite temperature. Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 2, pp. 181-191. http://geodesic.mathdoc.fr/item/TMF_1985_65_2_a2/