ANSARI, Qamrul H.; IDZIK, Adam; YAO, Jen-Chih. Coincidence and fixed point theorems with applications. Topological Methods in Nonlinear Analysis, [S. l.], v. 15, n. 1, p. 191–202, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.016. Acesso em: 3 jul. 2025.