Geodesic
Generating functional and the functional analog of Bogolyubov's variational method
Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 2, pp. 251-260 
B. V. Moshchinskii; C. Rodriguez; V. K. Fedyanin. Generating functional and the functional analog of Bogolyubov's variational method. Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 2, pp. 251-260. http://geodesic.mathdoc.fr/item/TMF_1980_45_2_a9/
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     title = {Generating functional and the functional analog {of~Bogolyubov's} variational method},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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Voir la notice de l'article provenant de la source Math-Net.Ru

On the basis of the generating functional introduced in this work (the functional is a natural generalization of the well-known Bogoliubov's generating functional to the case when path integrals are used in statistical mechanics), the functional analogue of the N. N. Bogoliubov variational method is investigated. The method suggested is illustrated by some nontrivial models of statistical mechanics.

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