DRAGOMIR, Silvestru Sever. Some Bessel type additive inequalities in inner product spaces. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 66, n. 2, p. 381–395, 2021. DOI: 10.24193/subbmath.2021.2.13. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1336. Acesso em: 19 apr. 2025.