Geodesic
Infinitesimal bending of surfaces in Lobachevskii space
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 3 
I. Ya. Ryabchikova. Infinitesimal bending of surfaces in Lobachevskii space. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 3. http://geodesic.mathdoc.fr/item/RM_1960_15_3_a11/
@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},
     year = {1960},
     volume = {15},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_3_a11/}
}
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