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Conti, M., Terracini, S. and Verzini, G. (2003) Infinitely Many Solutions to Fourth Order Superlinear Periodic Problems. Transactions of the American Mathematical Society, 356, 3283-3300.
https://doi.org/10.1090/S0002-9947-03-03514-1

has been cited by the following article:

• TITLE: Periodic Solutions of Some Polynomial Differential Systems in R4

  AUTHORS: Makhlouf Amar, Bousbiat Lilia

  KEYWORDS: Periodic Solution, Averaging Theory, Differential System

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.5 No.1, January 26, 2017

  ABSTRACT: We provide sufficient conditions for the existence of periodic solutions of the polynomial fourth order differential system , where A is a 4 × 4 constant matrix, P1, P2, P3 and P4 are polynomials in the variables x, y, u, v of degrees n, hi(t) = hi(t + 2π) with i = 1, 2, 3, 4 being periodic functions and ε is a small parameter.