@article{MZM_1971_9_3_a12,
     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/}
}