WU, Yanqiu; PENG, Yang. A NOTE ON SINGULAR VALUE INEQUALITIES FOR COMPACT OPERATORS. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 35, p. 347–350, 2015. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6426. Acesso em: 16 aug. 2026.