@article{DAN_1975_220_2_a2,
     author = {L. G. Gurov},
     title = {On the stability of {Lorentz} mappings. {Estimates} for derivatives},
     journal = {Doklady Akademii Nauk},
     pages = {273--276},
     publisher = {mathdoc},
     volume = {220},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_2_a2/}
}