@article{DE_1979_15_4_a15,
     author = {A. S. Fokht},
     title = {Bounds for the derivatives of ultraspherical polynomials in the $L_p$, $1<p<+\infty$ and $C$~metrics},
     journal = {Differencialʹnye uravneni\^a},
     pages = {717--724},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_4_a15/}
}