@article{MZM_1968_4_5_a8,
     author = {L. A. Leont'eva},
     title = {On the completeness of a~system of functions on a~segment},
     journal = {Matemati\v{c}eskie zametki},
     pages = {557--568},
     publisher = {mathdoc},
     volume = {4},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_5_a8/}
}