Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1966_6_a14, author = {K. Sh. Ramazanova}, title = {The theory of curvature of $X_2$ in $E_4$}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {137--143}, publisher = {mathdoc}, number = {6}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1966_6_a14/} }
K. Sh. Ramazanova. The theory of curvature of $X_2$ in $E_4$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1966), pp. 137-143. http://geodesic.mathdoc.fr/item/IVM_1966_6_a14/