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@article{CMH_1957__32_139154, author = {John Milnor}, title = {On the existence of a connection with curvature zero.}, journal = {Commentarii mathematici Helvetici}, pages = {215--223}, publisher = {mathdoc}, volume = {32}, year = {1957}, zbl = {0196.25101}, url = {http://geodesic.mathdoc.fr/item/CMH_1957__32_139154/} }
John Milnor. On the existence of a connection with curvature zero.. Commentarii mathematici Helvetici, Tome 32 (1957), pp. 215-223. http://geodesic.mathdoc.fr/item/CMH_1957__32_139154/