@article{DAN_1957_112_5_a9,
     author = {D. F. Kharazov},
     title = {On a class of operators which depend nonlinearly on a parameter},
     journal = {Doklady Akademii Nauk},
     pages = {819--822},
     year = {1957},
     volume = {112},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_5_a9/}
}