@article{DAN_1970_192_4_a10,
     author = {E. Ya. Roitenberg},
     title = {The observability of the solutions of nonlinear differential equations in {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {746--749},
     publisher = {mathdoc},
     volume = {192},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_4_a10/}
}