DRAGOMIR, S.S. A FUNCTIONAL ASSOCIATED WITH TWO BOUNDED LINEAR OPERATORS IN HILBERT SPACES AND RELATED INEQUALITIES. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 27, p. 225–240, 2010. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/5823. Acesso em: 18 may. 2026.