ANASTASSIOU GA. Self adjoint operator harmonic polynomials induced Chebyshev-Grüss inequalities. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2017 Mar. 1 [cited 2025 Feb. 5];62(1):39-56. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1692