%0 Journal Article %A V. A. Il'in %T Necessary and sufficient conditions for spatial decompositions to be bases and to be equiconvergent with a trigonometric series.~II %J Differencialʹnye uravneniâ %D 1980 %P 980-1009 %V 16 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_6_a1/ %G ru %F DE_1980_16_6_a1