@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/}
}