@article{DAN_1980_251_2_a6,
     author = {G. V. Radzievskii},
     title = {On bases consisting of derivative chains corresponding to boundary value problems},
     journal = {Doklady Akademii Nauk},
     pages = {283--287},
     year = {1980},
     volume = {251},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_251_2_a6/}
}