@article{DAN_1979_248_2_a2,
     author = {B. D. Boyanov},
     title = {Uniqueness of optimal quadrature formulas},
     journal = {Doklady Akademii Nauk},
     pages = {272--274},
     publisher = {mathdoc},
     volume = {248},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_248_2_a2/}
}