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@article{MAN_1974__210_162627, author = {Y\^otar\^o Tsukamoto}, title = {On the {Total} {Absolute} {Curvature} of {Closed} {Curves} in {Manifolds} of {Negative} {Curvature.}}, journal = {Mathematische Annalen}, pages = {313--320}, publisher = {mathdoc}, volume = {210}, year = {1974}, zbl = {0273.53033}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__210_162627/} }
Yôtarô Tsukamoto. On the Total Absolute Curvature of Closed Curves in Manifolds of Negative Curvature.. Mathematische Annalen, Tome 210 (1974), pp. 313-320. http://geodesic.mathdoc.fr/item/MAN_1974__210_162627/