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@article{IVM_1983_6_a13, author = {P. I. Sovertkov}, title = {The generalized {Christoffel} problem in a {pseudo-Euclidean} space $E_{n-1,1}$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {64--67}, publisher = {mathdoc}, number = {6}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1983_6_a13/} }
P. I. Sovertkov. The generalized Christoffel problem in a pseudo-Euclidean space $E_{n-1,1}$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1983), pp. 64-67. http://geodesic.mathdoc.fr/item/IVM_1983_6_a13/