@article{DAN_1964_159_5_a11,
     author = {A. L. Onishchik},
     title = {Connections with zero curvature and de {Rham's} theorem},
     journal = {Doklady Akademii Nauk},
     pages = {988--991},
     publisher = {mathdoc},
     volume = {159},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_5_a11/}
}