%0 Journal Article %A V. P. Il'in %T Existence and the optimal choice of the values of parameters in inequalities guaranteeing the validity of embedding theorems %J Zapiski Nauchnykh Seminarov POMI %D 1981 %P 63-87 %V 111 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1981_111_a3/ %G ru %F ZNSL_1981_111_a3