@article{MZM_1978_24_4_a5,
     author = {L. P. Vlasov},
     title = {Properties of generalized elements of best approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {513--522},
     publisher = {mathdoc},
     volume = {24},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_4_a5/}
}