@article{MZM_1978_24_5_a7,
     author = {A. A. Ligun},
     title = {Best quadrature formulas for certain classes of periodic functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {661--669},
     publisher = {mathdoc},
     volume = {24},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_5_a7/}
}