Conditions for the existence of solutions of discrete equations with a precompact set of values. Neliniini Kolyvannya, [S. l.], v. 26, n. 3, p. 434–440, 2023. DOI: 10.3842/nosc.v26i3.1434. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1114. Acesso em: 21 jan. 2026.