Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MS_1950__68_2_a0, author = {{\CYRYU}.{\CYRE}. {\CYRP}{\cyre}{\cyrn}{\cyrz}{\cyro}{\cyrv}}, title = {{\CYRO} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}-{\cyrg}{\cyre}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyri}{\cyrh} {\cyro}{\cyrb}{\cyrhrdsn}{\cyre}{\cyrk}{\cyrt}{\cyra}{\cyrh} {\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyrs}{\cyra} $v$ {\cyrv} $X_1$}, journal = {Matemati\v{c}eskij sbornik}, pages = {161--182}, publisher = {mathdoc}, volume = {68}, number = {2}, year = {1950}, zbl = {0039.37904}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MS_1950__68_2_a0/} }
Ю.Е. Пензов. О дифференциально-геометрических объектах класса $v$ в $X_1$. Matematičeskij sbornik, Tome 68 (1950) no. 2, pp. 161-182. http://geodesic.mathdoc.fr/item/MS_1950__68_2_a0/