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@article{IVM_1994_3_a15, author = {S. E. Stepanov and I. I. Tsyganok}, title = {A~vector field on {a~Lorentz} manifold}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {81--83}, publisher = {mathdoc}, number = {3}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1994_3_a15/} }
S. E. Stepanov; I. I. Tsyganok. A~vector field on a~Lorentz manifold. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1994), pp. 81-83. http://geodesic.mathdoc.fr/item/IVM_1994_3_a15/