@article{1183525016,
author = {Gluck, Herman},
title = {Unknotting $S^1$ in $S^4$},
journal = {Bull. Amer. Math. Soc.},
volume = {69},
number = {4},
year = {1963},
pages = { 91-94},
language = {en},
url = {http://dml.mathdoc.fr/item/1183525016}
}
Gluck, Herman. Unknotting $S^1$ in $S^4$. Bull. Amer. Math. Soc., Tome 69 (1963) no. 4, pp. 91-94. http://gdmltest.u-ga.fr/item/1183525016/