HAN, Zhenlai; SUN, Shurong. Symplectic Geometry Applied to Boundary Problems on Hamiltonian Difference Systems. CUBO, A Mathematical Journal, [S. l.], v. 8, n. 2, p. 73–86, 2006. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1606. Acesso em: 2 nov. 2025.