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@article{MAN_1929__101_159324, author = {A. Ranum}, title = {Spheres {Osculating} a {Curve} and {Quasiosculating} {Another} {Curve}}, journal = {Mathematische Annalen}, pages = {147--160}, publisher = {mathdoc}, volume = {101}, year = {1929}, zbl = {55.0395.04}, url = {http://geodesic.mathdoc.fr/item/MAN_1929__101_159324/} }
A. Ranum. Spheres Osculating a Curve and Quasiosculating Another Curve. Mathematische Annalen, Tome 101 (1929), pp. 147-160. http://geodesic.mathdoc.fr/item/MAN_1929__101_159324/