PERJAN, A.; RUSU, G. Convergence estimates for abstract second order differential equations with two small parameters and monotone nonlinearities. Topological Methods in Nonlinear Analysis, [S. l.], v. 54, n. 2B, p. 1093–1110, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.089. Acesso em: 27 jan. 2022.