@article{DAN_1957_117_6_a1,
     author = {G. M. Zhislin},
     title = {On the existence of characteristic functions for {Schr\"odinger's} equation},
     journal = {Doklady Akademii Nauk},
     pages = {931--934},
     publisher = {mathdoc},
     volume = {117},
     number = {6},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_117_6_a1/}
}