Geodesic
Equations for Green's functions obtained from a~variational principle
Teoretičeskaâ i matematičeskaâ fizika, Tome 21 (1974) no. 1, pp. 3-12

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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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     author = {A. K. Kazanskii},
     title = {Equations for {Green's} functions obtained from a~variational principle},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     volume = {21},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_1_a0/}
}
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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/