The Existence of Coupled Solutions for a Kind of Nonlinear Operator Equations in Partial Ordered Linear Topology Space. Communications in Mathematical Research, [S. l.], v. 28, n. 1, p. 65–74, 2021. Disponível em: https://www.global-sci.com/index.php/cmr/article/view/8720. Acesso em: 5 dec. 2025.