@article{DAN_1981_261_5_a6,
     author = {M. M. Dzhrbashyan},
     title = {The basis property for biorthogonal systems generated by boundary-value problems for differential operators of fractional order},
     journal = {Doklady Akademii Nauk},
     pages = {1054--1058},
     publisher = {mathdoc},
     volume = {261},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_5_a6/}
}