George A. Anastassiou. “Generalized Ostrowski, Opial and Hilbert-Pachpatte Type Inequalities for Banach Algebra Valued Functions Involving Integer Vectorial Derivatives”. Journal of Computational Analysis and Applications (JoCAAA), vol. 30, no. 1, Jan. 2022, pp. 78-94, http://eudoxuspress.com/index.php/pub/article/view/105.