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@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/} }
A. L. Onishchik. Connections with zero curvature and de Rham's theorem. Doklady Akademii Nauk, Tome 159 (1964) no. 5, pp. 988-991. http://geodesic.mathdoc.fr/item/DAN_1964_159_5_a11/