@article{IVM_1966_5_a5,
     author = {R. M. Geidel'man},
     title = {Bending of congruences of straight lines in the three-dimensional extended {non-Euclidean} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--48},
     publisher = {mathdoc},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1966_5_a5/}
}