Construction of symmetric third order difference operators on a Hilbert space. Gulf Journal of Mathematics, [S. l.], v. 21, n. 2, p. 118–148, 2025. DOI: 10.56947/gjom.v21i2.3598. Disponível em: https://gjom.org/index.php/gjom/article/view/3598. Acesso em: 2 nov. 2026.