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@article{CMH_1960__34_139191, author = {Bernt Lampe}, title = {Eine differentialgeometrische {Anwendung} der {Extremall\"angentheorie.}}, journal = {Commentarii mathematici Helvetici}, pages = {185--197}, publisher = {mathdoc}, volume = {34}, year = {1960}, zbl = {0094.34303}, url = {http://geodesic.mathdoc.fr/item/CMH_1960__34_139191/} }
Bernt Lampe. Eine differentialgeometrische Anwendung der Extremallängentheorie.. Commentarii mathematici Helvetici, Tome 34 (1960), pp. 185-197. http://geodesic.mathdoc.fr/item/CMH_1960__34_139191/