TY - JOUR AU - V. R. Portnov TI - S.\,L.~Sobolev projection operators for seminorms with infinite-dimensional kernels JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1976 SP - 252 EP - 263 VL - 140 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_1976_140_a13/ LA - ru ID - TM_1976_140_a13 ER -