A. AFROUZI, G.; KOLAGAR, S. M.; HADJIAN, A.; XU, J. Variational Approach for a Class of Two-point Fractional Boundary Value Systems. MATEMATIKA, [S. l.], v. 34, n. 2, p. 351–364, 2018. DOI: 10.11113/matematika.v34.n2.898. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/898. Acesso em: 5 dec. 2023.