@article{TRSPY_1992_193_a39,
     author = {R. L. Frum-Ketkov},
     title = {On closed mappings of infinite-dimensional spaces},
     journal = {Informatics and Automation},
     pages = {209--216},
     publisher = {mathdoc},
     volume = {193},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1992_193_a39/}
}