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@article{IVM_1966_3_a3, author = {R. M. Geidel'man}, title = {The tangent complex of a~pair of congruences of straight lines}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {32--38}, publisher = {mathdoc}, number = {3}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1966_3_a3/} }
R. M. Geidel'man. The tangent complex of a~pair of congruences of straight lines. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1966), pp. 32-38. http://geodesic.mathdoc.fr/item/IVM_1966_3_a3/