@article{SM_2003_194_3_a5,
     author = {I. I. Sharapudinov},
     title = {Mixed series in ultraspherical polynomials and
},
     journal = {Sbornik. Mathematics},
     pages = {423--456},
     publisher = {mathdoc},
     volume = {194},
     number = {3},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_3_a5/}
}