共 50 条
[25]
Positive Periodic Solutions of Systems of Second Order Ordinary Differential Equations
[J].
Positivity,
2006, 10
:285-298
[28]
PERIODIC SOLUTIONS FOR n-TH ORDER DELAY DIFFERENTIAL EQUATIONS WITH DAMPING TERMS
[J].
ARCHIVUM MATHEMATICUM,
2011, 47 (04)
:263-278
[29]
Existence and Uniqueness of Periodic Solutions for a Class of Higher Order Differential Equations
[J].
Mediterranean Journal of Mathematics,
2023, 20