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@article{MZ_1982__180_173184, author = {Nobuhiro Innami}, title = {Differentiability of {Busemann} {Functions} and {Total} {Excess.}}, journal = {Mathematische Zeitschrift}, pages = {235--248}, publisher = {mathdoc}, volume = {180}, year = {1982}, zbl = {0471.53045}, url = {http://geodesic.mathdoc.fr/item/MZ_1982__180_173184/} }
Nobuhiro Innami. Differentiability of Busemann Functions and Total Excess.. Mathematische Zeitschrift, Tome 180 (1982), pp. 235-248. http://geodesic.mathdoc.fr/item/MZ_1982__180_173184/