@article{DAN_1979_245_4_a4,
     author = {M. B. Orazov},
     title = {On the completeness of systems of elementary solutions for some operator differential equations on a half-line and on an interval},
     journal = {Doklady Akademii Nauk},
     pages = {788--792},
     publisher = {mathdoc},
     volume = {245},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_245_4_a4/}
}