On nonlinear functional system solutions that are continuous for t ∈ R. Neliniini Kolyvannya, [S. l.], v. 19, n. 1, p. 32–47, 2016. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/809. Acesso em: 21 jan. 2026.