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@article{CMH_1966__41_139311, author = {Ernest Dubois}, title = {Beitr\"age zur {Riemannschen} {Geometrie} im {Grossen.}}, journal = {Commentarii mathematici Helvetici}, pages = {30--50}, publisher = {mathdoc}, volume = {41}, year = {1966}, zbl = {0163.16402}, url = {http://geodesic.mathdoc.fr/item/CMH_1966__41_139311/} }
Ernest Dubois. Beiträge zur Riemannschen Geometrie im Grossen.. Commentarii mathematici Helvetici, Tome 41 (1966), pp. 30-50. http://geodesic.mathdoc.fr/item/CMH_1966__41_139311/