共 50 条
- [1] EXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF FIRST-ORDER NEUTRAL DIFFERENTIAL EQUATIONS [J]. HONAM MATHEMATICAL JOURNAL, 2018, 40 (01): : 1 - 11
- [6] Existence of Positive Solutions for a Class of Higher Order Neutral Functional Differential Equations [J]. Czechoslovak Mathematical Journal, 2001, 51 : 573 - 583