%0 Journal Article %A P. I. Naumkin %T Logarithmic nature of the long-time asymptotics of solutions of a~Sobolev-type nonlinear equations with cubic nonlinearities %J Sbornik. Mathematics %D 2023 %P 1024-1050 %V 214 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2023_214_7_a5/ %G en %F SM_2023_214_7_a5