@article{DAN_1983_273_1_a13,
     author = {M. A. Chahkiev},
     title = {Linear differential operators and optimal quadrature formulas},
     journal = {Doklady Akademii Nauk},
     pages = {60--65},
     year = {1983},
     volume = {273},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_1_a13/}
}