Geodesic
Approximate renormalization group transformation in the~theory of phase transitions. I.~Differential equation of the~renormalization group
Teoretičeskaâ i matematičeskaâ fizika, Tome 50 (1982) no. 2, pp. 313-320

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An approximate differential equation of the renormalization group for a $d$-dimensional system with degenerate $n$-component order parameter is found by the methods of functional integration without the use of perturbation theory. 
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     author = {I. A. Vakarchuk and Yu. K. Rudavskii and I. R. Yukhnovskii},
     title = {Approximate renormalization group transformation in the~theory of phase transitions. {I.~Differential} equation of the~renormalization group},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1982_50_2_a12/}
}
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I. A. Vakarchuk; Yu. K. Rudavskii; I. R. Yukhnovskii. Approximate renormalization group transformation in the~theory of phase transitions. I.~Differential equation of the~renormalization group. Teoretičeskaâ i matematičeskaâ fizika, Tome 50 (1982) no. 2, pp. 313-320. http://geodesic.mathdoc.fr/item/TMF_1982_50_2_a12/