%0 Journal Article %A V. G. Zamuraev %T On the Existence of Optimal Spaces for Nonlinear Functional Equations %J Differencialʹnye uravneniâ %D 2002 %P 849-851 %V 38 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_6_a17/ %G ru %F DE_2002_38_6_a17