TY - JOUR AU - A. A. Borichev TI - Convolution equations and the structure of $1$- and $2$-invariant JO - Doklady Akademii Nauk PY - 1989 SP - 788 EP - 792 VL - 304 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1989_304_4_a3/ LA - ru ID - DAN_1989_304_4_a3 ER -