@article{DAN_1990_313_3_a9,
     author = {E. I. Moiseev},
     title = {The basis property of eigenfunctions of a nonlocal boundary value},
     journal = {Doklady Akademii Nauk},
     pages = {556--559},
     publisher = {mathdoc},
     volume = {313},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a9/}
}