NAKOULIMA, O.; OMRANE, A.; VELIN, J. A nonlinear problem for age-structured population dynamics with spatial diffusion. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 2, p. 307–319, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.018. Acesso em: 17 jan. 2022.