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@article{MAN_1973__205_162491, author = {Dimitri Koutroufiotis}, title = {On a {Conjectured} {Characterization} of the {Sphere.}}, journal = {Mathematische Annalen}, pages = {211--218}, publisher = {mathdoc}, volume = {205}, year = {1973}, zbl = {0257.53056}, url = {http://geodesic.mathdoc.fr/item/MAN_1973__205_162491/} }
Dimitri Koutroufiotis. On a Conjectured Characterization of the Sphere.. Mathematische Annalen, Tome 205 (1973), pp. 211-218. http://geodesic.mathdoc.fr/item/MAN_1973__205_162491/