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Exact instanton-anti-instanton solutions and semiclassical expansion in the $\sigma$ model with fermions
Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 60-69 Cet article a éte moissonné depuis la source Math-Net.Ru

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The effective action obtained after exact integration with respect to the fermion fields is extremal on configurations that can be interpreted as instanton-anti-instanton solutions. The single-loop contribution of the obtained solutions to the functional integral is estimated. 
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     title = {Exact instanton-anti-instanton solutions and semiclassical expansion in the~$\sigma$ model with fermions},
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R. G. Ismagilov. Exact instanton-anti-instanton solutions and semiclassical expansion in the $\sigma$ model with fermions. Teoretičeskaâ i matematičeskaâ fizika, Tome 65 (1985) no. 1, pp. 60-69. http://geodesic.mathdoc.fr/item/TMF_1985_65_1_a5/

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