@article{DAN_1964_158_1_a9,
     author = {Ya. D. Mamedov},
     title = {Some properties of the solutions of non-linear equations of hyperbolic type in {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {45--48},
     publisher = {mathdoc},
     volume = {158},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a9/}
}