Samko, N., S. Samko, and B. Vakulov. “Fractional Integrals and Hypersingular Integrals in Variable Order Holder Spaces on Homogeneous Spaces”. Armenian Journal of Mathematics 2, no. 2 (June 4, 2009): 38–64. Accessed May 9, 2026. http://test.armjmath.sci.am/index.php/ajm/article/view/52.