STIEFENHOFER, P. Contraction and Periodic Orbits in Time-Periodic Filippov Systems. Annals of Mathematics and Physics, [S. l.], p. 166–176, 2025. DOI: 10.17352/amp.000161. Disponível em: https://www.mathematicsgroup.com/amp/article/view/AMP-8-261. Acesso em: 11 oct. 2025.