Geodesic
Dynamical breaking of~$U(N)$ and generation of Chern--Simons term in 4-fermion theories
Teoretičeskaâ i matematičeskaâ fizika, Tome 92 (1992) no. 1, pp. 166-171

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The phase structure of a three-dimensional four-fermion field theory is considered. It is shown that for $g0$ both parity and the $U(N)$ invariance of the model are spontaneously broken. For odd $N$, this leads to the generation of a Chern–Simons term if the fermions interact with a gauge field. 
@article{TMF_1992_92_1_a16,
     author = {K. G. Klimenko},
     title = {Dynamical breaking of~$U(N)$ and generation of {Chern--Simons} term in 4-fermion theories},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {166--171},
     publisher = {mathdoc},
     volume = {92},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_92_1_a16/}
}
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K. G. Klimenko. Dynamical breaking of~$U(N)$ and generation of Chern--Simons term in 4-fermion theories. Teoretičeskaâ i matematičeskaâ fizika, Tome 92 (1992) no. 1, pp. 166-171. http://geodesic.mathdoc.fr/item/TMF_1992_92_1_a16/