@article{DAN_1969_187_5_a1,
     author = {Yu. G. Borisovich and B. D. Gel'man and \`E. Muhamadiev and V. V. Obukhovskii},
     title = {The rotation of multivalued vector fields},
     journal = {Doklady Akademii Nauk},
     pages = {971--973},
     publisher = {mathdoc},
     volume = {187},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_5_a1/}
}