%0 Journal Article %A I. A. Vakarchuk %A Yu. K. Rudavskii %A I. R. Yukhnovskii %T Approximate renormalization group transformation in the theory of phase transitions. I. Differential equation of the renormalization group %J Teoretičeskaâ i matematičeskaâ fizika %D 1982 %P 313-320 %V 50 %N 2 %U http://geodesic.mathdoc.fr/item/TMF_1982_50_2_a12/ %G ru %F TMF_1982_50_2_a12