@article{JRAM_1893__112_148896,
     author = {H. Ruoss},
     title = {Ueber isochrone {Pendelschwingungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {53--57},
     publisher = {mathdoc},
     volume = {112},
     year = {1893},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1893__112_148896/}
}