@article{GDZPPN002381168, title = {Schlingknoten}, journal = {Mathematische Zeitschrift}, volume = {52}, year = {1950}, pages = {62-80}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002381168} }
Seifert, H. Schlingknoten. Mathematische Zeitschrift, Tome 52 (1950) pp. 62-80. http://gdmltest.u-ga.fr/item/GDZPPN002381168/