%0 Journal Article %A A. A. Borichev %T Convolution equations and the structure of $1$- and $2$-invariant %J Doklady Akademii Nauk %D 1989 %P 788-792 %V 304 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1989_304_4_a3/ %G ru %F DAN_1989_304_4_a3