Geodesic
Repulsion in an instanton gas, formation of a core in the nucleon, and the method of Bogolyubov hierarchies
Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 31-42 
I. V. Musatov; A. N. Tavkhelidze; V. F. Tokarev. Repulsion in an instanton gas, formation of a core in the nucleon, and the method of Bogolyubov hierarchies. Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 31-42. http://geodesic.mathdoc.fr/item/TMF_1991_86_1_a2/
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     title = {Repulsion in an~instanton gas, formation of a~core in the nucleon, and the method of {Bogolyubov} hierarchies},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1991_86_1_a2/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The effective action of the instanton gas in QCD with allowance for repulsion between the instantons is found. This repulsion leads to the formation of a repulsive core of the constituent quarks. The structure of the effective action is similar to an operator expansion. The method of Bogolyubov hierarchies is used to find the coefficient functions.

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