@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/