Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1981_30_5_a10, author = {P. I. Sovertkov}, title = {Christoffel problem in {pseudo-Euclidean} space $E_{n-1,1}$}, journal = {Matemati\v{c}eskie zametki}, pages = {737--748}, publisher = {mathdoc}, volume = {30}, number = {5}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a10/} }
P. I. Sovertkov. Christoffel problem in pseudo-Euclidean space $E_{n-1,1}$. Matematičeskie zametki, Tome 30 (1981) no. 5, pp. 737-748. http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a10/