V. Kumar, N. S. Kumar, and R. Sarma, “Unbounded translation invariant operators on commutative hypergroups”, MFAT, vol. 25, no. 3, pp. 236–247, Sep. 2019, Accessed: Feb. 04, 2026. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/729