Geodesic
Equations for Green's functions obtained from a variational principle
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 1, pp. 3-12 
A. K. Kazanskii. Equations for Green's functions obtained from a variational principle. Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 1, pp. 3-12. http://geodesic.mathdoc.fr/item/TMF_1974_21_1_a0/
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Voir la notice de l'article provenant de la source Math-Net.Ru

On the basis of the stationary conditions for a Legendre transform equations are obtained for the renormalized and unrenormalized Green's functions in the theories $\varphi^3$ and $\varphi^4$.

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