BARTUZEL, Grzegorz; FRYSZKOWSKI, Andrzej. Pointwise estimates in the Filippov lemma and Filippov-Ważewski theorem for fourth order differential inclusions. Topological Methods in Nonlinear Analysis, [S. l.], v. 52, n. 2, p. 515–540, 2018. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2018.014. Acesso em: 2 jul. 2025.