共 50 条
- [37] On symmetry of the product of two higher-order quasi-differential operators [J]. AIMS MATHEMATICS, 2023, 8 (04): : 9483 - 9505
- [38] Convergence of Biorthogonal Expansions of Functions on an Interval for Higher-Order Differential Operators [J]. Differential Equations, 2005, 41 : 660 - 676
- [40] HIGHER-ORDER MONOTONE-APPROXIMATION WITH LINEAR-DIFFERENTIAL OPERATORS [J]. INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, 1993, 24 (04): : 263 - 266