KANG, Shugui; CHENG, Sui Sun. Positive periodic solutions of superlinear systems of integral equations depending on parameters. Topological Methods in Nonlinear Analysis, [S. l.], v. 27, n. 2, p. 387–398, 2006. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2006.015. Acesso em: 13 mar. 2025.