Continuous solutions of systems of nonlinear difference equations with continuous argument, and properties of such solutions. Neliniini Kolyvannya, [S. l.], v. 10, n. 2, p. 177–183, 2007. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/428. Acesso em: 22 jan. 2026.