STRAUSS, V. A. A generalization of Gerisch’s theorem on biorthogonal systems. Methods of Functional Analysis and Topology, [S. l.], v. 7, n. 4, p. 11–17, 2001. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/162. Acesso em: 18 dec. 2025.