1.
Hwang D-Y, Yang G-S. Pre-Gr"uss type inequalities in $ 2 $-inner product spaces. Tamkang J. Math. [Internet]. 2007 Sep. 30 [cited 2024 Apr. 25];38(3):191-204. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/71