@article{SM_1979_35_4_a1,
     author = {S. B. Kadomtsev},
     title = {The impossibility of some special isometric immersions of {Lobachevskii} spaces},
     journal = {Sbornik. Mathematics},
     pages = {461--480},
     year = {1979},
     volume = {35},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1979_35_4_a1/}
}