@article{GDZPPN002062305, title = {Knots in the 4-sphere}, journal = {Commentarii mathematici Helvetici}, volume = {51}, year = {1976}, pages = {585-596}, zbl = {0346.55004}, url = {http://dml.mathdoc.fr/item/GDZPPN002062305} }
Gordon, C.M. Knots in the 4-sphere. Commentarii mathematici Helvetici, Tome 51 (1976) pp. 585-596. http://gdmltest.u-ga.fr/item/GDZPPN002062305/