§ 2. Verschlingungen stetiger Zyklen.
Topologie Bd. 1, GDML_Books, (1935), p. 423 / Harvested from
Access to full text 
@article{PPN379157292+dmdlog71,
     title = {\S\ 2. Verschlingungen stetiger Zyklen.},
     booktitle = {Topologie Bd. 1},
     series = {GDML\_Books},
     year = {1935},
     pages = {423},
     url = {http://dml.mathdoc.fr/item/PPN379157292+dmdlog71}
}

 (éd.). § 2. Verschlingungen stetiger Zyklen., dans Topologie Bd. 1, GDML_Books,  (1935), p. 423. http://gdmltest.u-ga.fr/item/PPN379157292+dmdlog71/