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@article{MOMA_1963__67_177227, author = {Yung-Chow Wong}, title = {A {Global} {Formulation} of the {Condition} for a {Curve} to {Lie} in a {Sphere.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {363--365}, publisher = {mathdoc}, volume = {67}, year = {1963}, zbl = {0144.20404}, url = {http://geodesic.mathdoc.fr/item/MOMA_1963__67_177227/} }
Yung-Chow Wong. A Global Formulation of the Condition for a Curve to Lie in a Sphere.. Monatshefte für Mathematik, Tome 67 (1963), pp. 363-365. http://geodesic.mathdoc.fr/item/MOMA_1963__67_177227/