@article{DM_1989_1_4_a2,
     author = {G. Kilibarda},
     title = {Bases of a~functional system},
     journal = {Diskretnaya Matematika},
     pages = {17--25},
     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1989_1_4_a2/}
}