@article{KUTGS_1997_23_a2,
     author = {V. V. Vishnevskii},
     title = {On the bicentenary of {N.~I.~Lobachevskii.} {Lessons} and results},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {23--32},
     publisher = {mathdoc},
     volume = {23},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1997_23_a2/}
}