@article{GDZPPN002351366,
title = {Differentiable Motions of Unknotted, Unlinked Circles in 3-Space.},
journal = {Mathematica Scandinavica},
volume = {30},
year = {1972},
pages = {107-135},
zbl = {0248.55003},
url = {http://dml.mathdoc.fr/item/GDZPPN002351366}
}
Wattenberg, Frank. Differentiable Motions of Unknotted, Unlinked Circles in 3-Space.. Mathematica Scandinavica, Tome 30 (1972) pp. 107-135. http://gdmltest.u-ga.fr/item/GDZPPN002351366/