DALBONO, Francesca. Sign-preserving solutions for a class of asymptotically linear systems of second-order ordinary differential equations. Topological Methods in Nonlinear Analysis. Online. 6 March 2022. Vol. 59, no. 1, pp. 163 - 191. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2021.023.