TY - JOUR AU - S. N. Kudryavtsev TI - Approximations of compact sets of functions by piecewise polynomial surfaces in spaces of smooth functions JO - Matematičeskie zametki PY - 1991 SP - 72 EP - 81 VL - 49 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1991_49_6_a8/ LA - ru ID - MZM_1991_49_6_a8 ER -