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@article{IM_1983__71_143006, author = {Werner Ballmann}, title = {On the {Lengths} of {Closed} {Geodesics} on {Convex} {Surfaces.}}, journal = {Inventiones mathematicae}, pages = {593--598}, publisher = {mathdoc}, volume = {71}, year = {1983}, zbl = {0505.53020}, url = {http://geodesic.mathdoc.fr/item/IM_1983__71_143006/} }
Werner Ballmann. On the Lengths of Closed Geodesics on Convex Surfaces.. Inventiones mathematicae, Tome 71 (1983), pp. 593-598. http://geodesic.mathdoc.fr/item/IM_1983__71_143006/