Benmahmoud, S., and D. Drihem. “Continuous Characterization of the Besov Spaces of Variable Smoothness and Integrability”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 12 (January 17, 2023): 1601 - 1624. Accessed April 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6578.