Maslov Index and Quasi-Symplectic Isomorphisms. Contemporary Mathematics , [S. l.], v. 3, n. 2, p. 203–216, 2022. DOI: 10.37256/cm.3220221363. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/1363. Acesso em: 24 dec. 2025.