[5] Gaines, R. E., Mawhin, J. L.:
Coincidence Degree, and Nonlinear Differential Equations. Lecture Notes in Math., Vol. 568. Springer Berlin (1977).
DOI 10.1007/BFb0089537 |
MR 0637067
[8] Jiang, D., Nieto, J. J., Zuo, W.:
On monotone method for first and second order periodic boundary value problems and periodic solutions of functional differential equations. J. Math. Anal. Appl. 289 (2004), 691-699.
DOI 10.1016/j.jmaa.2003.09.020 |
MR 2026934 |
Zbl 1134.34322
[9] Li, X., Lin, X., Jiang, D., Zhang, X.:
Existence and multiplicity of positive periodic solutions to functional differential equations with impulse effects. Nonlinear Anal., Theory Methods Appl. 62 (2005), 683-701.
DOI 10.1016/j.na.2005.04.005 |
MR 2149910 |
Zbl 1084.34071
[14] Liu, Y., Bai, Z., Gui, Z., Ge, W.:
Positive periodic solutions of impulsive delay differential equations with sign-changing coefficients. Port. Math. (N.S.) 61 (2004), 177-191.
MR 2066673
[15] Liu, Y., Ge, W.:
Stability theorems and existence results for periodic solutions of nonlinear impulsive delay differential equations with variable coefficients. Nonlinear Anal., Theory Methods Appl. 57A (2004), 363-399.
MR 2064097 |
Zbl 1064.34051
[20] Pierson-Gorez, C.:
Impulsive differential equations of first order with periodic boundary conditions. Differ. Equ. Dyn. Syst. 1 (1993), 185-196.
MR 1258896 |
Zbl 0868.34007