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math.CA2010
Positive periodic solutions of singular systems of first order ordinary differential equations
Haiyan Wang
The existence and multiplicity of positive periodic solutions for first non-autonomous singular systems are established with superlinearity or sublinearity assumptions at infinity…
math.CA2010★ 58 cited
Positive periodic solutions of singular systems
Haiyan Wang
The existence and multiplicity of positive periodic solutions for second order non-autonomous singular dynamical systems are established with superlinearity or sublinearity assumpt…