KRAWCEWICZ, W.; LV, Y.; XIAO, H. Multiple solutions with prescribed minimal period for second order odd Newtonian systems with symmetries. Topological Methods in Nonlinear Analysis, [S. l.], v. 47, n. 2, p. 659–679, 2016. DOI: 10.12775/TMNA.2016.024. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2016.024. Acesso em: 22 jul. 2024.