@article{DAN_1981_257_2_a3,
     author = {V. B. Kudryavtsev},
     title = {On completeness for function systems},
     journal = {Doklady Akademii Nauk},
     pages = {274--278},
     publisher = {mathdoc},
     volume = {257},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_257_2_a3/}
}