BOROGOVAC, M. A SHIFT OPERATOR APPLICATION ON INEQUALITIES IN \(\ell^2\) SPACE. Matematichki Bilten, [S. l.], v. 17, n. 1, p. 39–44, 1993. Disponível em: https://bilten.smm.org.mk/index.php/bilten/article/view/1528. Acesso em: 14 aug. 2026.