@article{DE_1987_23_11_a2,
     author = {V. Ya. Derr},
     title = {On the generalized de la {Vall\'ee{\textendash}Poussin} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1861--1872},
     year = {1987},
     volume = {23},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a2/}
}