Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1965_1_a22, author = {Sh. R. Sharipov}, title = {A study of global characteristics}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {180--183}, publisher = {mathdoc}, number = {1}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1965_1_a22/} }
Sh. R. Sharipov. A study of global characteristics. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1965), pp. 180-183. http://geodesic.mathdoc.fr/item/IVM_1965_1_a22/