@article{MZM_1968_3_6_a9,
     author = {F. S. Lisin},
     title = {Problem of mean-square approximation related to the investigation of generators of $l^1$ algebra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {703--706},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a9/}
}