@article{MZM_1968_4_1_a1,
     author = {L. P. Vlasov},
     title = {Methods of summation and best approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {11--20},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a1/}
}