Geodesic
Approximation of functions on an $m$-dimensional sphere by Ces\`aro means of Fourier--Laplace series
Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 343-353.

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An investigation of the error in approximations of functions defined and continuous on the unit sphere of $m$-dimensional euclidean space by Cesàro sums of Fourier–Laplace series. 
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     author = {D. K. Ugulava},
     title = {Approximation of functions on an $m$-dimensional sphere by {Ces\`aro} means of {Fourier--Laplace} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {343--353},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a12/}
}
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D. K. Ugulava. Approximation of functions on an $m$-dimensional sphere by Ces\`aro means of Fourier--Laplace series. Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 343-353. http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a12/