Existence of Positive Periodic Solutions for n-Dimensional Nonautonomous System

Zhang, Q. F., Tang, X. H., & Zhang, Q. M. (2011). Existence of Periodic Solutions for a Class of Discrete Hamiltonian Systems. Discrete Dynamics in Nature and Society, 2011(), 627-640. https://doi.org/10.1155/2011/463480
GHERGU, M., & RADULESCU, V. (2003). EXISTENCE AND NONEXISTENCE OF ENTIRE SOLUTIONS TO THE LOGISTIC DIFFERENTIAL EQUATION. Abstract and Applied Analysis, 2003(), 995-1003. https://doi.org/10.1155/S1085337503305020
LI, Y., & XING, W. (2006). EXISTENCE OF POSITIVE PERIODIC SOLUTION OF A PERIODIC COOPERATIVE MODEL WITH DELAYS AND IMPULSES. International Journal of Mathematics and Mathematical Sciences, 2006(), 943-958-075. https://doi.org/10.1155/IJMMS/2006/38617
Zheng, D. Y., Lu, Y. G., Song, G. Q., & Lu, X. Z. (2014). Global Existence of Solutions for a Nonstrictly Hyperbolic System. Abstract and Applied Analysis, 2014(), 483-489-1150. https://doi.org/10.1155/2014/691429
KIM, W. S. (1995). EXISTENCE OF PERIODIC SOLUTIONS FOR NONLINEAR LIENARD SYSTEMS. International Journal of Mathematics and Mathematical Sciences, 1995(), 265-272. https://doi.org/10.1155/S0161171295000329