@article{JRAM_1937__177_150001,
     author = {Wilhelm Damk\"ohler},
     title = {Struktur der geschlossenen rektifizierbaren {Kurven.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {37--54},
     publisher = {mathdoc},
     volume = {177},
     year = {1937},
     zbl = {0016.22903},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1937__177_150001/}
}