Geodesic
Massive Gross–Neveu model in the leading order of the $1/N$ expansion. Allowance for the temperature and the chemical potential
Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 2, pp. 226-233 
K. G. Klimenko. Massive Gross–Neveu model in the leading order of the $1/N$ expansion. Allowance for the temperature and the chemical potential. Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 2, pp. 226-233. http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a6/
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     title = {Massive {Gross{\textendash}Neveu} model in the leading order of the~$1/N$ expansion. {Allowance} for the temperature and the chemical potential},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {226--233},
     year = {1988},
     volume = {75},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_2_a6/}
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The massive Gross–Neveu model is treated self-consistently in the leading order of the $1/N$ expansion. The properties of the model when the temperature and the chemical potential are included are studied. It is shown that there exists a critical value of the chemical potential at which the effective mass of the fermion abruptly changes its value.

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