@article{UZMU_1951_148_148_a2,
     author = {A. V. Yablonovskii and V. G. Yampol'skii},
     title = {Some special questions relating to interpretations of the plane geometry of {Lobachevskii}},
     journal = {Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {148},
     number = {148},
     year = {1951},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZMU_1951_148_148_a2/}
}