Hong, Yong A theorem on spherical fractional integrals of variable order. (Chinese. English summary) Zbl 0932.26004 J. Math. Study 31, No. 2, 184-188 (1998). MSC: 26A33 Fractional derivatives and integrals Keywords:spherical fractional integral; Zygmund class; Poisson integral PDFBibTeX XMLCite \textit{Y. Hong}, J. Math. Study 31, No. 2, 184--188 (1998; Zbl 0932.26004)