共 50 条
- [2] ORDER OF APPROXIMATION OF UNBOUNDED FUNCTIONS BY POSITIVE LINEAR OPERATORS [J]. NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (01): : 169 - &
- [8] THE ORDER OF THE APPROXIMATION OF FUNCTIONS BY LINEAR POSITIVE OPERATORS [J]. DOKLADY AKADEMII NAUK SSSR, 1957, 114 (06): : 1158 - 1161
- [9] THE ORDER OF THE APPROXIMATION OF FUNCTIONS BY LINEAR POSITIVE OPERATORS [J]. DOKLADY AKADEMII NAUK SSSR, 1959, 128 (04): : 674 - 676