@article{IVM_1974_11_a6,
     author = {A. O. Korneeva and A. P. Norden},
     title = {The isotropic normal congruences that are connected with curves of $n$-dimensional {Lorentz} space $L_n(n\geq 4)$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {51--54},
     year = {1974},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_11_a6/}
}