@article{DAN_1958_122_6_a9,
     author = {P. E. Sobolevskii},
     title = {Generalized solutions of the first order differential equations in {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {994--996},
     publisher = {mathdoc},
     volume = {122},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_122_6_a9/}
}