@article{MZM_2013_94_2_a11,
     author = {I. I. Sharapudinov},
     title = {Limit {Ultraspherical} {Series} and {Their} {Approximation} {Properties}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {295--309},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_94_2_a11/}
}