NIETO, Juan J. and UZAL, José M. Periodic solutions of superlinear and sublinear state-dependent discontinuous differential equations. Topological Methods in Nonlinear Analysis. Online. 12 September 2021. Vol. 58, no. 1, pp. 79 - 96. [Accessed 3 July 2024]. DOI 10.12775/TMNA.2021.016.