@article{MZM_1968_3_5_a11,
     author = {S. Z. Rafal'son},
     title = {Mean approximation of functions by {Fourier-Gegenbauer} sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {587--596},
     publisher = {mathdoc},
     volume = {3},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_5_a11/}
}