@misc{RM_1993_48_2_a25,
     title = {Nikolai {Ivanovich} {Lobachevskii} (photo)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1993_48_2_a25/}
}