TY - JOUR AU - O. I. Kuznetsova TI - On some properties of polynomial operators of triangular form in a space of continuous periodic functions of two variables JO - Doklady Akademii Nauk PY - 1975 SP - 1304 EP - 1306 VL - 223 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1975_223_6_a4/ LA - ru ID - DAN_1975_223_6_a4 ER -