Fractional Sobolev space with variable exponents: Study of Kirchhoff problem by Berkovits degree theory. Nonlinear Studies, [S. l.], v. 31, n. 4, p. 1135–1147, 2024. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/3494. Acesso em: 14 jan. 2026.