@article{MAN_1936__112_159850,
     author = {P. Scherk},
     title = {\"Uber reelle geschlossene {Raumkurven} vierter {Ordnung}},
     journal = {Mathematische Annalen},
     pages = {743--766},
     publisher = {mathdoc},
     volume = {112},
     year = {1936},
     zbl = {62.0797.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1936__112_159850/}
}