@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/}
}