@article{GDZPPN002273284,
title = {Die permanenten Wellen in ringf\"ormigen Kan\"alen},
journal = {Mathematische Annalen},
volume = {101},
year = {1929},
pages = {424-445},
zbl = {55.0470.05},
url = {http://dml.mathdoc.fr/item/GDZPPN002273284}
}
Geppert, H. Die permanenten Wellen in ringförmigen Kanälen. Mathematische Annalen, Tome 101 (1929) pp. 424-445. http://gdmltest.u-ga.fr/item/GDZPPN002273284/