@article{RM_1960_15_3_a11,
     author = {I. Ya. Ryabchikova},
     title = {Infinitesimal bending of surfaces in {Lobachevskii} space},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_3_a11/}
}