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@article{MS2_1972__30_166227, author = {Frank Wattenberg}, title = {Differentiable {Motions} of {Unknotted,} {Unlinked} {Circles} in {3-Space.}}, journal = {Mathematica Scandinavica}, pages = {107--135}, publisher = {mathdoc}, volume = {30}, year = {1972}, zbl = {0248.55003}, url = {http://geodesic.mathdoc.fr/item/MS2_1972__30_166227/} }
Frank Wattenberg. Differentiable Motions of Unknotted, Unlinked Circles in 3-Space.. Mathematica Scandinavica, Tome 30 (1972), pp. 107-135. http://geodesic.mathdoc.fr/item/MS2_1972__30_166227/