@article{FAA_1975_9_1_a10,
     author = {A. I. Virozub},
     title = {Power completeness of the system of elementary solutions of a differential equation in {Hilbert} space},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {52--53},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1975_9_1_a10/}
}