@article{VMUMM_1993_1_a6,
     author = {R. N. Vinogradov},
     title = {On the extension of a theorem of {P.} {S.} {Aleksandrov} to mappings},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {28--31},
     publisher = {mathdoc},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1993_1_a6/}
}