Periodic-type solutions for differential equations with positively homogeneous functionals. Neliniini Kolyvannya, [S. l.], v. 25, n. 1, p. 119–132, 2022. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1061. Acesso em: 21 jan. 2026.